His father's will Will dated 13 Aug 1737 and proved 28 April 1738 names wife Mary, sons James and John; daughters Elizabeth Howland, Mary Lawrence, Patience Nye, Hannah Joanes, and two daughters not yet married. John was 65 years at death.
Lydia Brownson and Maclean Mclean, “The Rev. Richard Bourne of Sandwich, Mass.,” New England Historic and Genealogical Register, Vol 118, 1964, Pg 200
Sometimes the only way to prove parentage is to find the father's will.