Elizabeth was born at Yarmouth 6 October 1718, dau. of William[4} and Dorcas Baker] Chase.Her father moved to Harwich in 1721.[NEHGS Register, 87:131.
Joshua was born probably at Eastham 14 March 1694/5, son of Barnabas and Sarah Wixom. His birth isn't specific, but two siblings were born at Eastham. [Mayflower Descendant, 13:59.]
An intention of marriage between Joshua Wixom of Yarmouth and Elizabeth Chase of Harwich was entered at Harwich 18 December 1731 (sic) bur she would have been only 13 years old.The record appears on a page with others dated 1736+/ a more logical timeframe.
I could find evidence of one child, Barnabas, b. 1740. There are several family trees on Ancestry.com, some show 2 wives whose years overlap.Some trees show several children, with little or no documentation.Access Ancestry at a local library if not a subsriber