not sure if this is the same ...
United States Civil War Soldiers Index, 1861-1865
Percy Miller
beginning rank: Private
final rank: Corporal
2nd Regiment, Rhode Island Infantry

info from death record:
Return of a Death
City of Providence
Feb. 5, 1886
Percy Miller
aged 54-1-2
place of death: 30 South Court St.
usual residence: same
male, white married
[no spouse name listed]
occupation: silversmith
born in Woodside, Scotland
son of Thomas Miller and Ellen ???, both born in Scotland
burial: N. B. Ground
informant: Marion Miller
cause of death: cancer of the liver

employed as a mechnic, he was living in Providence in 1880 federal census:
Household Role Sex Age Birthplace
Percy Miller Self Male 48 Scotland
Margaret Miller Wife Female 48 Scotland
*Marion Miller Daughter Female 23 Scotland
George Miller Son Male 10 Rhode Island
Florence Miller Daughter Female 5 Rhode Island

living in Providence in 1870:
Household Role Sex Age Birthplace
Percy Miller Male 37 Scotland
Margaret Miller Female 37 Scotland
Ellen Miller Female 16 Scotland
Marian Miller Female 14 Scotland
Mary Miller Female 11 Rhode Island
Edwin P Miller Male 5 Rhode Island
George T Miller Male 1 Rhode Island

living in Providence in 1860:
Household Role Sex Age Birthplace
Percy Miller Male 28 Scotland
Margaret Miller Female 28 Scotland
Ellen Miller Female 5 Scotland
Marian Miller Female 4 Scotland
**Mary Miller Female 1 Rhode Island

children include
* Marion (Miller) Smith, born May 31, 1856 in Scotland, died July 4, 1936 in Seattle, Washington, wife of Albert G. Smith; per death record, she was cremated
** Mary Q. (Miller) Dobson, b.c. 1858 in Providence, died June 21, 1937 in Bemidji, Minnesota, wife of John Dobson [see memorial # 106968331]
Edwin Percy Miller, b.c. 1861, died Sept. 4, 1862 [see memorial # 125821963]
George Thomas [Thomas George?] Miller, born July 21, 1869 in Providence, who married Flora Isabella Currie on Aug. 2, 1899 in West Superior, Wisconsin
infant son, still born, died March 22, 1872 in Providence