President Benjamin Harrison and his wife had a son, Benjamin Harrison II.

Benjamin II and his wife had a son, Benjamin Harrison III.

Benjamin III and his wife had a son, Benjamin Harrison IV.

Benjamin IV and his wife had a son, Benjamin Harrison V.

Benjamin V and his wife had a son, President William Henry Harrison. Benjamin V also had another son, William Henry’s brother, Carter Bassett Harrison.

Carter Bassett Harrison and his wife, Jane Byrd, had a daughter, Caroline Harrison.

Caroline Harrison married William Henry Lawrence, and they had a son, Henry Harrison Lawrence.

Henry Harrison Lawrence married Mary Elen (Molly) Ross, who was the daughter of Samuel Lafayette Ross and Cassandra Kinkaid Slaughter

Samual Lafayette Ross was the son of James Thomas Ross and Sarah (Sally) Cook. James Thomas Ross had another son, Samuel Lafayette’s brother, Alfred Cowan Ross.

Alfred Cowan Ross married Nancy Margaret (Madge) Johnson and had a daughter, Una Perry Ross.

Una Perry Ross married Matthew Shields DeWoody, and they had a daughter, Herma Vera DeWoody.

Herma Vera DeWoody married Albert Augustine Hammond and had a son, who is my father.

so, President Benjamin Harrison is my first-cousin-in-law, 10 times removed…

or something like that…