Also, if you win over the hearts of your inlaws in this manner, they might out of mere observation watch out for you and if your husband is for instance buying them everything they want and you seem left out, they might say “what do you want?” to you as well and include you.
Secondly, he is with you away from family generally. It is natural that when he is with them for the little time he is, he treats them special. You should not begrudge him that.