Possible christening for John Sisman: 4 Oct 1761 Buckworth, Huntingdonshire, parents George and Mary.
Married Ann Barwell 9 Jul 1783 Wood Walton, Huntingdonshire.
Here are their children:
George 18 Jun 1785 Wood Walton
William christened 26 May 1787 Wood Walton, buried 3 Jun 1787
John christened 1 Apr 1789 Wood Walton
A tree on FamilySearch has Ann Barwell buried 7 Sep 1792 Wood Walton, but I have no source.
Looks like John remarried to Sarah Knowles 28 Dec 1793 Wood Walton and died Q1 1846 Huntingdon, aged 85.
Bethany