I don't understand. It's the house you and your husband are buying for the family (you and him). Why do you need your parents' money? I would wait till you two have saved enough to buy your own house if you are short on the down payment or work out a proposal for both of you to be able to pay back the money. It's not your job alone to pay it back. What if it's your mother in law lends you and his the money? Is he planning to pay back. I think your husband needs to think about what's important. Is it money or his wife/this relationship that's important? I cannot believe any decent man would ask for his in law's money with no plan of returning even if they don't need it. Sorry I am a bit hush on this one.