Particularly detailed baptism records for three of their granddaughters confirm Thomas as the son of "John Chatt, smelter, and Elizabeth late Short". John is identified as "the late John Chatt" only in the 1805 baptism record, but is not described as "late" in the 1800 and 1803 records, possibly (though by no means conclusively) suggesting he was alive in 1803 but died before 1805.