Thomas was a member of the Newark MM when Margaret is supposed to have been born (Dec 1684), but surviving records for Newark do not start till 1686. However, Margaret is supposed to have married Hugh Walker about 1701. By then, I believe Thomas was a member of Centre Meeting. I would think that if Margaret was his daughter, she would have come before the Centre Meeting to ask permission sometime in the 1700 / 1701 timeframe. Unfortunately, so far I have not found any of the Centre MM records online.