How do I deal with what my in-laws are doing?

My Inlaw's don't pay their bills.Their house has almost been foreclosed on twice & their phone is off.My husband says his dad hides the bills from his mom,that still doesn't give them an excuse not to pay them. They expect my husband to help them everytime.We were saving up to have the actual wedding this summer & those funds got depleted to help them out. We live in a 3Rm apartment & we're trying 2 save for the party,a house and the car we have. Everytime they ask my husband for help they ask "Doesn't Mel make enough" or you guys just bought whatever. I tell my husband he doesn't have to explain how we spend OUR money, we're not children & we're almost 30. Everytime my husband talks to them it's as if they don't care how this is affecting us. He has helped them in the past but they expect him to continue to do this even though they owe him almost $8,000 within 2 years. I've already told him that if we have kids this can't continue we would have to take care of our family.