John was married to Mary Brigham in 1668 in Watertown. Mary Brigham was born in 1638/39 in Cambridge. She died in 1676 in Watertown. Children of John Fay and Mary Brigham were:

• i. John Fay II.
  
• ii. David Fay was born on Oct 15 1671 in Marlboro MA. He died while quite young
  
• iii. Samuel Fay was born on Oct 11 1673 in Marlboro MA, died Nov 10 1732 in Westborough.
  
• iv. Mary Fay was born on Feb 10 1675 in Marlboro MA.

John then married Susanna Shattuck Morse, a widow of one Joseph Morse and daughter of James Shattuck (Short bio).

Children of John and Susanna were:

• v. David (2)
  
• vi. Gershom, born Oct 19 1681, died Nov 24 1720
  
• vii. Ruth, born Jul 15 1684, married Increase Ward, Jr. Jun 28 1706. They had 7 children.
  
• viii. Deliverance, born Oct 7 1686, died Jan 22? 1711, married Benjamin Shattuck (a cousin) Feb 20 1706. They had 2 children one of whom, Deliverance, married Samuel (above).