He is married to Sarah Edgecomb.
They got married on August 5, 1731 at New London, New London, Connecticut, USA, he was 25 years old.Source 2
Child(ren):
A collection of family records: with biographical sketches bearing the name Douglas
Charles Henry James Douglas
Pg 71-72
16.
ROBERT4 DOUGLAS (Thomas3, Robert2, William1), born in New London, Conn., Dec. 28, 1705. He married, Aug. 5, 1731, Sarah Edgecome. Robert and his wife were both members of the church, Oct. 5, 1735. He lived on the farm which had been his father's. The house, which had two large front rooms, was often used as a place for holding meetings. Mr. Adams frequently had lectures there, and the children of the neighborhood were brought to these lectures for baptism. At one time nine were baptized there. Robert died in October, 1781 His widow removed with her son, Daniel, to Wallingford, Vt, in 1797 or 1798, and died a few months after. Children, all born in New London:
38. i. Hannah5, b. June 5, 1732; m. Nicholas Bishop.
39. ii. Thomas5, b. Aug. 1, 1734; m. Grace Richards.
40. iii. Sarah5, b. July 15, 1738; m. Edward Raymond.
41. iv. Robert5, b. Aug. 7, 1740; m. Hannah Gardiner.
v. Mary5, b. Dec. 4, 1742; m. 1764, Daniel Edgerton, Norwich; set. Vt.
42. vi. Samuel5, b. Feb. 26, 1744-5; m. Rebecca Avery.
43. vii. Mehitabel5, b. Sept. 8, 1747; m. Benjamin Gorton.
44. viii. Joseph5, b. June 1, 1750; m. Mary Thompson.
45. ix. Daniel5, b. May 22, 1752; m. Lydia Douglas.
Robert Douglass and Sarah Edgecomb are 2nd cousins. They have the same great grandparents: Robert Hempstead & Joanna Willie.