Can I Just Divorce My Father in Law?

This is the ramsey call of the day. Today's question comes from regina in kentucky. Regina writes, my husband's 86 year old father moved in with us after his wife passed away. At the time, he had over two million dollars in retirement investments. Two years ago, he met a woman who's 54 and has spent well over 800 thousand dollars on her. Nothing his children say will deter him from pulling money out of his investments to make her happy. Hangedwo what is the family obligations lie to support aging family members? Can i just divorce my father in law?