On 18 May 1691 when Josiah was 22, he first married Elizabeth in Reading, MA.

On 30 Dec 1724 when Josiah was 56, he second married Grace Eaton (17531) , daughter of John Eaton (10671) (10 Oct 1645-25 May 1691) & Dorcas Pearson (6407) (25 Apr 1650-perhaps 8 Dec 1728), in Reading, MA. Born on 12 Jan 1677 in Reading, MA.81 Grace died in Reading, MA, on 19 Jul 1756; she was 79.