My In-laws are always asking for money, husband says it's none of my business?

If they are asking money from your husband and not from you, as in dowry, and it is not affecting your life as a couple, I suggest do not interfere in the matter. Let your husband deal with his parents. But, if this money-lending is creating financial problems in your life then you should make your husband understand. Sit with him and calmly discuss the matter. Else, wait for sometime, see how things go, and if your husband giving his parents some money every month is not causing any financial trouble at your end, let your husband deal with his parents. He has grown up with them, he knows them better and can make up whether their demands are undue or valid.