John Chamberlain [#3], s/o William Chamberlain [#1] and his wife Rebecca, probably sister of Sarah Shelley, b. Billerica abt 1654, d. Billerica 1 Apr 1712, m. (1) Billerica 6 Dec 1681 Deborah Jaco, m. (2) unknown wife [son Abraham was directed to pay "his mother" in John's will, though Abraham's mother is literally Deborah]. Will of "John Chamberlain of Billerica", dated 22 Feb 1711/12, exhibited 28 Apr 1712, names son John, son Abraham [he to pay his three sisters and his mother beside her thirds], both co-executors. Inventory 24 Apr 1712. Samuel Hill of Billerica appointed guardian for Abraham who was "ab't 19 Years Old".