In Sep 1751 Josiah first married Sarah Farr in Stow, MA. Born 19 Jan 1734/5 in Stow, MA. Sarah died in Harvard, MA on 21 Sep 1773.

Sarah, daughter of Stephen and Sarah (Stone) Farr.

On 3 Feb 1774 when Josiah was 42, he second married Sarah Dwelley (25268) , daughter of Joseph Dwelley (34128) (18 Feb 1705-27 Aug 1749) & Mary Randall (9900) (31 Jul 1707-28 May 1752), in Harvard, MA. Born ca 1746. Sarah was baptized in the Second Church of Scituate, on 5 Oct 1726.52 Sarah died in Whitingham, Windham County, Vermont on 26 Feb 1816.