'JOHN PRATT ([son of] Joseph) was born at Weymouth, 17 May, 1668. He married Mercy Newcomb, daughter of John and Ruth Newcomb, born at Braintree, 1665; died before 13 May, 1721. Her father made his will on the last-named date, and mentioned "my grandchildren, the children of my daughter Mercy Pratt deceased ..." ...'