Isaac McClary was born in 1874. He was probably the son of William McClary.
In 1880, he was living in the household of his grandfather, Alex McClary. Alex only had two sons, and his son Robert doesn't seem to have any children. William hasn't been found after 1870, so it's likely that he died and his children lived with his father.
Sources
1880 Census: "1880 United States Federal Census" Year: 1880; Census Place: Bristol, Lincoln, Maine; Roll: 483; Page: 446D; Enumeration District: 121 Ancestry Sharing Link - Ancestry Record 6742 #44272925 Isaac Mcclary (6), single grandson, At Home, in household of Alex Mcclary (62) in Bristol, Lincoln, Maine, USA. Born in Maine.
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