He is married to Phebe Lay.
They got married on November 26, 1667 at Stonington, New London, Connecticut, USA, he was 21 years old.Source 3
Child(ren):
New England families, genealogical and memorial: Vol 3
by William Richard Cutter
Pg 1176
(Ill) John, son of Colonel George Denison, was born July 18, 1646, in Roxbury, and settled in Stonington. He married Phebe, daughter of Richard Lay, of Saybrook. Children:
Phebe, born 1667;
John, 1669;
George, 1671, mentioned below;
Robert, 1673;
William, 1675;
Daniel, 1680;
Samuel, 1683;
Ann, 1684;
Jacob, 1692.