An Abigail Remington, daughter of Matthew deceased, married Anthony Olin, son of Henry Jr., in 1793. Is Anthony's father the second husband of Abigail's mother, Martha (Randall) Remington? Or did Martha marry Henry Sr.? (needs more research)
I believe Henry must have had three wives. Two are mentioned in his will, but there must have been an earlier wife who was the mother of his childen.
His will names his wife Martha, then later his wife Sarah, as well as three sons and three daughters, one of whom is referred to as deceased. Why doesn't he also mention his son Henry, who had probably died by then? He does name his grandson Anthony, who I am assuming is the Anthony, son of Henry Jr., who married Abigail Remington. So, it appears that three years after her mother's remarriage, Abigail married the grandson of her stepfather.