Brother in law (loud overbearing mid aged gatoey) tried this one even further before his sister and my son had their wedding.
Gatoey went to every member of his / his sisters extended family ( mother, father, brothers, sisters, aunts, uncles, nephews, nieces etc) and told them to add their details to a document he had prepared which he intended to give to the Aust. embassy in Bkk so all thee folks would start to get their monthly payment of 50,000Baht per month forever, all because his sister was marrying into a family with a farang in the picture.
My son confiscated the document and insisted the gatoey go with my son to every person he had 'signed up' and tell them there is no such payment.
Gatoey then contacted a lowlife lawyer, asking the lawyer to help him sue the Aust. embassy because the embassy was stealing their money.
Lawyer refused and a few days later gave my son a letter with his signature, one copy to be handed to all on the gatoey's list saying there is no such payment.