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Male Frank Thomson Click to view Frank Thomson in the family tree

Frank was born on July 20th, 1873.1   Frank's father was James Thomson and his mother was Lillie Landon.  His maternal grandparents were Edward H. Landon and Mary Brownell. He had a brother named Maurice.  He was the older of the two children.1 

Family Details of Frank's family with Marion Wilcox

1 phelps.FTW @ Tree #1309
Further sources/citations:
World Family Tree Vol. 3, Ed. 1 @ Tree #3455, 3455.ftw