In laws are visiting. FIL has never had any regard to housekeeping tasks and every time he goes to the toilet he leaves skid marks and shit stains everywhere. I told MIL as I had to clean everything and she was embarrassed and very sorry, but not sure if I should say anything to him. We come from cultures where even me talking to my MIL about this was a step too far as we usually don't say a thing to in laws at all. Wwyd?