Seems you are thinking about all this way too much. I guess, you let the kids be, and do not get too much into the situation as who is your FIL and MIL giving more attention to. If you have to visit your in-laws house once in while and not daily, then it is more of a reason to not let yourself stress out so much. You can talk to your husband if it is bothering your mental peace. See, what he says. But I think it is a trivial issue (because you are not living with them) and you should just not let this thing affect your peace.
You can make all the children play together by coming up with some game and divert their attention and yours too from how MIL and FIL are behaving. Thank your stars that you don't have to live with them, and be happy in the present situation thinking how things could have been if you had been in a joint family.
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