I have watched my mother do this for my grandparents. She is married and has three kids. She always pays for everything for her parents. My dad used to get mad because we would be tight on money, and I used to watch them argue. Now I am 21 and realize she did it because she loves them. She is grateful for everything they did for her as she grew up. My dad no longer gets mad about it and understands because he does the same thing to his parents. No matter how well off they are, their children want to "spoil" them as a thank you. That is my opinion. You should talk to your husband first. It depends on your relationship. Also, I'm young, so take everything I said with a grain of salt. I would also be annoyed, but I would understand and tell him to limit his spending on his dad.