How are you related to John King Fairfield Sharp? I am related through his daughter Alice, then through Alice and Amos' daughter Ida, then through Ida's daughter Elsie.
Then name Ripley comes into the family through Alice's grandmother, on her mother's side, who was Elizabeth Ripley.
As for the name Hollingshead, the only connection I can make is that one of William's (William and Abigail) sisters, Mary, married Isaac Hollingshead, and another sister, Anne, married William Hollingshead. Which would make them Amos' great Uncles.
Do you have any info on William's mother? My info says she was Hannah Edwards daughter of Captain Robert Edwards of NY but I can't verify that. I wonder if she was actually Hannah Owens.