John Billington had two sons - Francis and John Jr.
John Jr. died,before his father - probably in 1628.
Francis married Christian (Penn) Eaton, widow of
Francis Eaton, Pilgrim. Everything is documented
in the Mayflower Families -- vol. 9...your library
can get you a copy. Five generations are documented
in this book. I'm descended from Francis Christian's
daughter, Martha. she married Samuel Eaton (her step-brother)
who is the son of Francis Eaton and his first wife, Sarah.
Samuel came on the Mayflower with his parents.