Mollie was born in Washington Twp., Indiana Co., PA, the daughter of Abraham Lincoln Brewer and "Jennie" Hannah Jane Miller. She married Archibald A. Potts on November 5, 1903 in Indiana, Indiana Co., PA. He died in 1913. She remarried Harry White Hullihen on September 16, 1914 in Indiana, Indiana Co., PA. He died in 1953. She remarried Albert B. McGary.

Archie and Mollie were the parents of six children:
1. Jess James Potts
2. "Earl" Clark Earl Potts
3. Bertha A. (Potts) Torrance
4. Blain Potts
5. Mae Potts
6. Beryl Potts
Note: The names, Mae and Beryl Potts, are listed in the obituary of half-brother, Jim Hullihen. They do not appear in the censuses, so they probably died young or in infancy.

Harry and Mollie were the parents of eight children:
1. Helen Irene Hullihen
2. "Bruce" Harry Bruce Hullihen
3. Kathleen Grace (Hullihen) Cunningham
4. "Bud" Charles E. Hullihen
5. Bernard Hullihen
6. "Gene" Robert Gene Hullihen
7. "Shorty" Hazel L. (Hullihen) Anderson
8. James Dwight Hullihen

Mollie had no children with her third husband.

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The following obituary appeared in the "Indiana Evening Gazette" (Indiana, PA) on Saturday, October 27, 1975, page 9, column 2:

MARY E. HULLIHEN McGARY, 88, of Boron, Calif., died Wednesday, Sept. 24, 1975.

A daughter of Abraham and Jennie Miller Brewer, she was born Sept. 21, 1887 at Creekside.

Mrs. McGary lived her early life in Creekside and spent a number of years in Homer City.

She was first married to Archie Potts who died in 1913 in a mine accident. Her second husband, Harry Hullihen died in 1953.

Surviving are her husband, Albert McGary; five sons: Jess Potts, Barnesboro; Earl Potts, Thrall, Texas; Charles Hullihen, Indiana RD 2; Robert and Jim Hullihen, both of Phoenix, Ariz.; two daughters: Mrs. William (Kathleen) Cunningham, Morrisville; Mrs. William (Hazel) Anderson, Indiana RD 1; two sisters, Mrs. Mae Swiderski, Washington; Mrs. Clara Potts, Indiana; 32 grandchildren; several great-grandchildren and great-great-grandchildren.

Friends will be received from 7-9 p.m. today and 3-5 and 7-9 p.m. Sunday at Robinson-Lytle's, Indiana, where services will be held Monday, Sept. 29 at 11 a.m. with the Rev. Fr. Arthur Dilg officiating. Interment will be in Greenwood Cemetery.