Do not see any John's in the tree aorund that time / age with sons called John.
There is John 1798-63, son of Mathew 1748-1813, son of the original William 1716-1788. According to my records he did not have male heir. Mathew 1794-1862, brother of John 1798-1863 had a son John 1836-1866. This John did not have male heir?
Lots of Johns in all lines but none with the right dates and right parents. Have started to imput the lines - alot to do.