On 25 Jun 1740 when Benjamin was 18, he married
Mercy Phillips (45626) , daughter of
Joseph Phillips (29 Mar 1685-13 Jun 1767) &
Mercy Eames (26592) (1 Oct 1687-2 Apr 1760), in Marshfield, MA.
52 Born on 14 Aug 1725 in Marshfield, MA. Mercy died in Marshfield, MA, on 26 Apr 1785; she was 59.
Mercy married Benjamin Hatch Jr, while her sister Jerusha married Benjamin Hatch, no Jr. It’s not clear which Benjamin either is.
There were at least two Benjamin Hatches at the time.
a. Benjamin, the son of John & Grace (Stetson) Hatch born 28 Jun 1721
b. Benjamin, the son of Joseph & Mary Hatch born 23 Apr 1722
Based on these dates, the first Benjamin married Jerusha, and the second was Benjmin Jr. who married Mercy.