Remember Merry, that just as Son-in-law can mean step son, Mother-in-law could be Step Mother.
I have looked but can't see an Isaiah Griffiths marriage to a XX Lumber (although you are not sure the Isaiah Griffiths marriage is the right one are you?)
Do you know when Isaac died? Did he leave a will? - Edit, just reread, and you don't. hmm.
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