I got the two wills, but no help in finding the elusive father-in-law//wife. The names are either children, siblings or trusted friends (who I can trace and see no family connection to).
In my quick scan through the wills, I noticed that John LEVERMORE was called
brother-in-law in the son's will, but LEVERMORE was not included in the list of married daughters in the father's will. (John LEVERMORE was a witness to the father's will.)
I thought it possible that he was a child of the son's mother by a previous husband. In the convention of the time, this relationship could also be described as
brother-in-law.
(Obviously, he could also have been the husband of a deceased daughter of the father.)
Were you able to identify how John LEVERMORE fits into the family?