Not sure what you mean about the estate being protected when Francis died. Francis left no Will, so made no attempts to protect his estate, small though it was.
However, his father left the residue of his estate to Francis's wife - unusual as you would expect it to be left to Francis's children (ie his grandchildren) even if it was left in trust for them if they were minors. Unusual to leave it all straight to a daughter in law, who could in theory squander it, or remarry and her new husband spend it or leave it to his family, and therefore the direct line would miss out.
If you are saying there was property that in time went to Franciss children ,then looking for Harriets Will may prove interesting. Unlikely to give us clues about Francis's beginnings, but you never know what Wills will throw up till you read them!