My father-in-law took away my pension while I was in confinement

My husband and I got married not too long ago, and right after, his parents started traveling extensively.

Over the past two years, they've practically toured the entire country, spending their entire retirement pension each month. I've often suggested to my husband that he should encourage them to save some money for their future. However, he always responds with frustration, "Are you planning to live off my parents? Why do you keep worrying about their finances? As their children, it's our responsibility to support them in their old age—otherwise, what's the point of having children?"