I have John Alton's father, William and William's wife, Mercy Eliot, as well as Mercy's parents. I am descended from John Alton and Elizabeth Hosmer's daughter Elizabeth, so I have her descendants, who are the Joslins. I lack the descendants of John and Elizabeth's other children, though.
Mercy Eliot's mother was Sarah Collins, and have the Collins line back to her grandfather, Henry Collins. Sarah Collins' father was Joseph Collins and her mother was Sarah Hires. Do you have any data on the Hires line?
I have William Alton's children as:
John, b. 1720 William, Jr. Joseph David Benjamin, b. 1742
Do you have anything further on William's children?