THIS GRAVE IS A "CENOTAPH", which means that the bodily remains are buried elsewhere, namely in France. See Findagrave #56636100.
As per this edit update from another contributor:

RE: William Brigham (173529630)
Suggested edit: Hello: FYI - I think this memorial should be labeled as a cenotaph - Lt William Brigham Jr is buried in France - memorial #56636100 - URL is below. You can email [email protected] and request that your memorial be labeled as a cenotaph and do please make reference to where he's actually buried so that the two memorials will have links to each other. Thanks!

Contributor: Alicelth (47131242)
_______________________________________________
On this BRIGHAM - PORTER gravestone:

[on the front of the stone]
ADDINGTON "MONROE" BRIGHAM 1837-1924
wife
MARY ESTABROOK [BRIGHAM] 1838-1921

CORA E. [ESTABROOK BRIGHAM] 1868-1892

WILLIAM M. [MUNROE BRIGHAM] 1864-1928
wife
FLORENCE R. [RHODA EYERS BRIGHAM] 1856-1932

Lieut. W.[WILLIAM] MUNROE [BRIGHAM] 1894-1918
[died July 22, 1918 in Epieds, Loiret, Centre, France]

6 low stones in front:

"B" / Father / Mother / Cora / Florence / Will

[on the back of the stone]
W.[WILLIAM] AUBREY PORTER 1872-1946

ELLA B. [BRIGHAM] PORTER 1866-1957

GEORGE L.[LOCKHEART] PORTER 1896-1975

GEORGE B.[BRIGHAM] PORTER 1929-2003
wife
LOUISE A. [O'BRIEN PORTER] 1932 - [blank]

4 low stones in back:

Father / Mother

George L. Porter
U.S. ARMY WORLD WAR I
1896-1975

George B. Porter
CPL U.S. AIR FORCE
WORLD WAR II
4/30/1929 - 6/11/2003
___________________________________________________________
Some info from sources:
*info from ancestry.com's ALL MY FAMILY #2 FAMILY TREE, maintained by "Wolverine 1501".
**info from ancestry.com's FERGUSONS, COCHELL, TREFREYS FAMILY TREE, maintained by "Jill Cochell".
***info from ancestry.com's HOWARD EDWARD FAMILY TREE, maintained by "Heidi_Snelling".
___________________________________________________________

*1836 May 27 Birth Info Marlborough, MA. ADDINGTON MUNROE BRIGHAM born to parents: BARNABAS BRIGHAM (1786-1865) & MARY ANN FYFE (b. 1796).

1836 July 9 Marlborough, MA, Record of Baptism of ADDINGTON MUNROE BRIGHAM, son of BARNABUS BRIGHAM.

1850 U.S. Census Marlborough, MA.
BARNABAS BRIGHAM age 63, farmer, estate $3,500.
MARY BRIGHAM age 48, born in Vermont.
MINDWELL BRIGHAM age 18, female, attending school.
"ADINGTON" M. BRIGHAM age 13, attending school.
JOSEPH E. BRIGHAM age 6, attending school.
EDWARD B. RICE age 15, laborer, attending school.
LAWSON M. GASSET age 25, laborer, born in Vermont.

1855 Massachusetts State Census, Marlborough.
ADDINGTON M. BRIGHAM age 18, farmer, born in MA.
His parents:
BARNABAS BRIGHAM age 69, farmer, born in MA.
MARY BRIGHAM age 53, born in Vermont.
others:
WILLIAM F. BRIGHAM age 26, carpenter, born in MA.
JOSEPH E. BRIGHAM age 11, born in MA.
FRANCES BRIGHAM age 30, female, born in Maine.
ABEL MAYNARD age 43, born in MA.

1861 May 7 Marriage Record, Westminster, MA. ADDINGTON M. BRIGHAM age 24, farmer, parents: BARNABAS BRIGHAM & MARY [FYFE]. The bride is MARY ESTABROOK age 23, born in Westminster, parents: JOHN ESTABROOK & MATILDA.

1862 Feb. 1 Birth Record Marlborough, MA. ABBY ALICE BRIGHAM born to parents: farmer ADDINGTON M. BRIGHAM & MARY ESTABROOK (she was born in Westminster, MA).

1864 January 23 Birth Record Marlborough, MA. WILLIAM MUNROE BRIGHAM born to parents: ADDINGTON M. BRIGHAM & MARY ESTABROOK.

1864 Civil War info:
Name: "Adington" M Brigham
Residence: Massachusetts
Occupation: Farmer
Age at Enlistment: 27
Enlistment Date: 15 Jul 1864
Rank at enlistment: Private
State Served: Massachusetts
Survived the War?: Yes
Service Record: Enlisted in Company E, Massachusetts 5th Infantry Regiment on 22 Jul 1864.
Mustered out on 16 Nov 1864 at Readville, MA.
Birth Date: abt 1837
Death Date: 2 Jan 1924
Sources: Massachusetts Soldiers, Sailors and Marines in the Civil War
Massachusetts GAR: Journal of the Annual Encampment
GAR Dept of Massachusetts 1866-1947 (Sargent).

1868 June 27 Birth Record Marlborough, MA. CORA ESTABROOK BRIGHAM born to parents: "pedlar" ADDINGTON M. BRIGHAM & MARY ESTABROOK.

1880 U.S. Census Marlborough, MA. ADDINGTON M. BRIGHAM age 43, farmer. Wife MARY [ESTABROOK] BRIGHAM age 42. Children: ABBY A. BRIGHAM 18; NELLEY M. BRIGHAM 16; ELLA A. BRIGHAM [PORTER] age 13; & CORA E. BRIGHAM age 11. And a boarder GEORGE D. COLLINS age 24, farm laborer.

**1881 Census of Canada, Lower Horton, Kings, Nova Scotia. They are living with their maternal Aunt (and Uncle). DAVID BENT age 45 [1833-1893] & wife RUTH LOCKHART BENT age 35 [1846-1916]. GEORGE PORTER age 12 & ANNIE PORTER age 11. [WILLIAM] AUBREY PORTER age 9. They are all in the Methodist Church of Canada. [The PORTER siblings' father JOHN HARDING PORTER was married again in 1880, thus it appears that their mother, ELMIRA ANNIE LOCKHART PORTER, had died prior to that].

***1891 Scotland Census for Mid-Mains, Duffus. ROBINA M. McCOOK [PORTER] was 19 months old. Her parents: JAMES McCOOK age 38, farm servant, & wife ISABELLA McCOOK

1892 October 2 Death Record Marlborough, MA. CORA E. BRIGHAM age 24 years & 3 months & 5 days; milliner; daughter of ADDINGTON M. BRIGHAM & MARY ESTABROOK; died of "Scrofula".

1893 March 15 Marriage Record Marlborough, MA. First marriage for both: ABBIE A. BRIGHAM age 31, dressmaker, parents: ADDINGTON M. BRIGHAM & MARY ESTABROOK. The groom was GEORGE F. NICHOLS age 39, born in Lynnfield, MA, farmer, parents: JOHN NICHOLS & DORCAS BROWN.

1894 December 12 Birth Record Marlborough, MA. WILLIAM M. BRIGHAM [Jr.] born to parents: WILLIAM M. BRIGHAM [Sr.] & FLORENCE R. EYERS.

1895 June 19 Marriage Record Marlborough, MA. First marriage for both: ELLA A. BRIGHAM age 28, telegraph operator, parents: ADDINGTON M. BRIGHAM & MARY ESTABROOK. The groom is WILLIAM A.[AUBREY] PORTER age 23 born in Nova Scotia, occupation is clerk, parents: [JOHN] HARDING PORTER [1841-1906] & [ELMIRA] ANNIE "LOCKETT"[LOCKHART] [born 1841].

1895 October 19 Naturalization Record. WILLIAM A. [AUBREY] PORTER born January 9, 1872 in Nova Scotia. Current residence Brigham Street, Marlborough, MA.

1896 August 12 Birth Record Marlborough, MA. GEORGE L.[LOCKHEART] PORTER born to parents: baggage master WILLIAM AUBREY PORTER (born in Nova Scotia) & ELLA BRIGHAM (born in Marlborough).

1900 U.S. Census Marlborough, MA Cedar Hill & Crane Meadow District. ADDINGTON BRIGHAM age 63, born in MA March 1837, married, farmer. Wife MARY [ESTABROOK] BRIGHAM age 62, born Feb. 1838 in Vermont, married 39 years, had 4 children with 3 living. Boarder ALEX McCLINTOCK age 19, born in Canada, farm laborer.

1900 U.S. Census Marlborough, MA, 26A Water St. WILLIAM M. BRIGHAM [Sr.] age 36, born Jan. 1864, lawyer. Wife FLORENCE R. [EYERS] age 34 born June 1866 in England, married 11 years, immigrated in 1882. 3 sons: "WLYSSES" A. BRIGHAM age 9 born August 1890; ALFRED E. BRIGHAM age 8 born August 1891; & WILLIAM M. BRIGHAM age 5 born Dec. 1894. Also there is 19 year old sister-in-law RUBY S. EYERS.

1900 U.S. Census Marlborough, MA, 96 Shawmut Avenue. WILLIAM A. [AUBREY] PORTER age 26, born January 1874 in Nova Scotia, immigrated in 1890, railroad baggage master. ELLA M. BRIGHAM PORTER age 33, born August 1866, married 5 years, has 3 sons. GEORGE L. PORTER age 3, August 1896; AUBREY H.[HOWARD BRIGHAM] PORTER age 2, Aug. 30, 1897; & HARDING L. [LAWTON] PORTER age 5 months, born Dec. 28, 1899.

1910 U.S. Census Marlborough, MA, Brigham Street. ADDINGTON BRIGHAM age 73, owns house, farmer on home farm. Wife is MARY E. [ESTABROOK] BRIGHAM age 72, married 48 years, [incorrect entry says she had 1 child].
Next door is WILLIAM M.[MUNROE] BRIGHAM age 46, renting, lawyer. Wife FLORENCE R. BRIGHAM age 44, born in England, married 20 years, 3 children. Sons: ALFRED E. BRIGHAM age 17; WILLIAM M. BRIGHAM age 15.

1917 May 31 World War I Registration Card for WILLIAM MUNROE BRIGHAM Jr., age 22, born Dec. 12, 1894, single, residence 112 Brigham St., Marlborough, MA. He is a candidate for reserve officer in United States Government in Plattsburg Barracks, NY. He was 1 year as a private in the cavalry in Vermont National Guard. Description: medium build and height; blue eyes, & light hair.

1920 U.S. Census Marlborough, MA, Brigham Street. ADDINGTON BRIGHAM age 82, farmer, owns house, general farm. Wife MARY E. [ESTABROOK] BRIGHAM age 82.

1920 U.S. Census Marlborough, MA, Shawmut Ave. W.[WILLIAM] AUBREY PORTER age 48, born in Canada, merchant in grocery store, owns his house and business. Wife ELLA E. [BRIGHAM] PORTER age 53, railroad telegraph operator. Sons work with their father in the grocery store as salesmen: GEORGE L. PORTER age 23 & HARDING PORTER age 20.

1920 U.S. Census Marlborough, MA, Glen Street. GEORGE F. NICHOLS age 66, own house, owns general farm. Wife ABBIE A. [BRIGHAM] NICHOLS age 58.

1929 April 30 Birth & Death Information on Social Security Application & Claims. GEORGE BRIGHAM PORTER born in Marlborough, MA, to parents: GEORGE L. [LOCKHEART] PORTER & ROBINA McCOOK. GEORGE B. died on 11 June 2003.

1930 U.S. Census Marlborough, MA, 96 Shawmut Avenue. WILLIAM A. [AUBREY] PORTER age 57, is a wholesale grocery shipper, owns house valued at $8,000. Wife ELLA A. [BRIGHAM] PORTER age 62, married at age 27, had been a railroad telegraph operator.

1940 U.S. Census Marlborough, MA, 64 Berkeley St. Mrs. [GEORGE L.] ROBINA [McCOOK] PORTER age 50, born in Scotland, married, finished high school, owns house valued $4,000, nurse, income $1,000. Children: ROBERT PORTER age 16, finished 2 years high school; DOROTHY PORTER age 13, finished 1 year high school; GEORGE [B.] PORTER age 10; & DONALD PORTER age 9.

1942 Draft Registration World War II
GEORGE LOCKHEART PORTER age 45, born August 12, 1896, in Marlborough, MA. Next of kin: W. AUBREY PORTER 96 Shawmut Avenue, Marlborough, MA. George works for Electro Line Corp. 260 Tremont St., Boston, MA. He lives in Medfield, MA.

1957 Marlborough MA City Directory.
PORTER, ELLA widow W.A.PORTER, h 96 Shawmut Ave.
PORTER, GEORGE B. (LOUISE) emp LaPpoint's, r. 21 Exeter St.
PORTER, ROBINA M. Mrs., nurse, 64 Berkeley St.

1975 August Death Index of Social Security. GEORGE [LOCKHEART] PORTER born August 12, 1896; residence is Medway, Norfolk County, MA.

***1976 Sept. 10 Death info for ROBINA M. McCOOK PORTER in Marlborough, MA.

2003 June 11 Death Index Massachusetts. GEORGE [B.] PORTER born April 30, 1929. Spouse is LOUISE [A.] O'BRIEN.
____________________________________________________________