Just a reminder, If possible, I would not register a marriage in Thailand if you do not know the wife long and well, as well her family.
I do know my wife and her family well, but still have chosen not to register my marriage with her. 1. I do not need to, 2. If divorce, I file seperation papers with my officials, and we will be divorced in one year time no matter what she does. 3. We have a contract, everything In my orign country is mine, and everything in Thailand in her name is hers.
It will minimizing future problems if you take precautions before future things happens