Source 1: Genealogical Dicitonary Of The Early Settlers Of New England by Savage;

Source 2: History & Genealogy Of The Prentice Family In New England by Binney;
Robert died in 1783, age 69; He married (1) Rebecca Smith of Needham; She D: 1746; he M: (2) Widow Eunice hammond in 1746; He had children by both of these wives;

Robert was executor of the estate of Sarah Prentice, daughter of James Prentice & Susannah Johnson;
Sarah is his 1st Cousin, one generation removed; Sarah Prentices will was dated 14 August 1738;