Vineyard Land Deed ??????????

[Swimmer]

My mother just receives a request for her to sign a quit claim deed transfer for $350.00 giving up all rights to two side by side camp/lot sites her grandmother bought in 1904 in West Tisbury across from the airport on the Edgartown-West Tisbury Road. The lots were recorded and are 25' x 60'. They are supposedly now a hunting preserve although I have never heard of one in that area and it is fenced in. I find it extremely interesting how people/s can take someones property by adverse possession without clear title and try to make it thier own. What if someones house sits on these two little pieces of land? Also they were part of a 2300 lot parcel which sits on 100 acres. I think I'd be foolish to let my mother sign off on this until all is checked out. Thoughts anyone?