Moses and his wife Mercy were also first cousins. Moses married a second time to Mary Couch, widow of Benjamin Couch.
Moses ST. JOHN and Mercy OLMSTEAD were married about 1730 in Norwalk, Fairfield County, Connecticut. Mercy OLMSTEAD, daughter of Nathan OLMSTEAD and Mercy COMSTOCK, was born on 17 January 1710/1 in Norwalk, Fairfield County, Connecticut.35 She died on 23 November 1748 at the age of 37 in Norwalk, Fairfield County, Connecticut.
Moses ST. JOHN and Mercy OLMSTEAD had the following children: