My husband's ex-wife signed a quitclaim deed to the house as they were finalizing their divorce. However at the time he also gave her written note saying he would give her his (now our home) when his mother passes away. Reason being because he would get his mother's house in the will and would have no need of another house. However his mother has since taken him out of the will since learning this. My question is as to whether or not my husband is now legally obligated to still relinquish our home after his mother's death?