Martha Morton's death date is now corrected to match her tombstone info, and now the children's birthdates work fine. She being 40 years younger isn't very unusual for such a healthy old eccentric gentleman.
Looks like the duplicate William Joshua Hudsons may need to be remerged, but not until we get his parents and siblings right. His dates don't line up with theirs. I have a feeling he's not really my 6th g-uncle, and that his parents are actually unknown at this point.
https://www.findagrave.com/memorial/49081168/martha_ellen_hudson