This is a tough one, both side are family. No I don't recommend you to add fuel to the fire by taking sides.
who is the mediator in your family? Usually is the dad or mother, you might want to speak with one of your parents first.
If mediator is not available, the only way out is to move out. If you don't have plans start planning now. .. If you have plans, try to push forward with it.
All in All, both side are family so don't take side. Provide a listening ear to your husband.
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