Lizzie - it's quite a few years since I looked into this part of my tree, but I have recorded the marriage you have found, plus the note 'groom and bride had same father'. I remember reading a lengthy piece online about George BP's short life as a school head (he died in 1835 having 'caught a chill' at his father's funeral), where this matter was described. I haven't looked for it again (yet) but perhaps it has been withdrawn ?
