Sarah's husband name is not John Churchill - it's John Chandler.
'Sarah [daughter of Elnathan and Jane Weston], m. Joseph Chandler;'
This has an error: It was not Joseph Chandler, but John Chandler.
'Sarah Weston (Elnathan, Edmund) did not marry John Churchill, on 10 April, 1717. John Chandler and Sarah Weston were married 4 March, 1707/8. [Ante, 10:185.]'