I am also researching the Martin family members - children of John & Jane (Flanders) Martin - from Amesbury who were in Hollis.I believe that three of the Martin siblings - Stephen, John and Sarah - were in the Hollis/Monson area in the 1740s.My theory is that John Martin and his wife Rachel came in 1738.Sarah Martin married Moses SAUNDERS in Amesbury in 1740 and they appear to the Moses Saunders family in Spaulding's “An account of some of the early settlers of West Dunstable, Monson and Hollis, N. H." John Martin also appears in this book. Stephen may have come with his siblings or later.I don't know when/where John Martin Sr. and his wife Jane died - the last time I can find them in the Amesbury church records is 1728.
I am trying to piece together what happened to all the siblings to help find clues - my ancestor was Stephen's sister, Sarah (Martin) Saunders - Moses & Sarah Saunders supposedly left Monson in 1747, but it appears that he must have died sometime before May 1748 when his widow's twins were baptised in Amesbury.Then I loose all trace of Sarah - I don't know if she remarried, what happened with her 6 small children, etc.Her daughter Abigail Saunders shows up in Hollis in 1763 for her marriage to Isaac Powers, but I have no idea if Abigail may have been living with a relative (perhaps her uncle Stephen's or Uncle John's family?) in Hollis during the 1750s?John Martin Jr. left the area "before the Revolution" and then I lose all trace of him as well. I have not found many people researching this family so would be happy to share more info that I have.