Looks like two different Thomas Crosby’s have been mixed.
https://www.familysearch.org/tree/person/details/LB1N-TLT Has
Birth name:
Thomas Crosby
Gender:
Male
Birth:
1703
Harwich, Barnstable, Massachusetts, United States
Marriage:
Spouse: Mary Crosby
Oct 6 1725
Harwich, Barnstable, Massachusetts Bay, British Colonial America
Death:
Sep 30 1757
Brewster, Barnstable, Massachusetts Bay, British Colonial America
Burial:
Oct 1757
Brewster, Barnstable, Massachusetts Bay, British Colonial America
Parents:
Thomas Crosby
Hannah Crosby (born Snow)
Wife:
Mary Crosby
Children:
Tabatha Crosby
James Crosby I.
Eunice Crosby
Lemuel Crosby
Soloman Crosby
Martha Crosby
Elisha Crosby
https://familysearch.org/ark:/61903/4:1:LVYS-NV9 Has
Thomas Crosby
Adds: sibling(s)
Gender:
Male
Birth:
Apr 17 1704
Harwich, Barnstable, Massachusetts Bay, British Colonial America
Christening:
Jan 2 1708
Harwich, Barnstable, Massachusetts Bay, British Colonial America
Marriage:
Spouse: Elizabeth Hopkins
Aug 9 1733
Harwich, Barnstable, Massachusetts Bay, British Colonial America
Death:
Dec 13 1781
Northeast, Dutchess, New York, United States
Burial:
1781
Millerton, Dutchess, New York, United States
Parents:
John Crosby
Hannah Crosby (born Bangs)
Wife:
Elizabeth Crosby (born Hopkins)
Children:
Bethiah Crosby
Sgt. Enoch Crosby
Thomas Crosby
Phoebe ROBINSON (born Crosby)
Hannah Stevens (born Crosby)
Elizabeth Hopkins (born Crosby)
Benjaman Crosby
Neither has Experience Crosby