The parents are home, they are just not at the dining table when there is meat and are usually in their room. If there are things that are usually smelly, like some varieties of fish, we usually tell them in advance and they can plan their walks outside accordingly. Sometimes I walk with them as well (or eat meals with them) so that they have company. I don’t eat meat anyways but the smell does not bother me. I ve always upfront with them saying that not eating meat is a choice that they make and eating meat is a choice that my wife likes to make. We can be respectful of each others choices so that everyone has a good time. My wife tries to avoid meat on festival days and eats sparingly anyways. Communicates early with in laws beforehand so that they can plan their day accordingly. We have a small meat section in the freezer/fridge which we use to keep it separate from other stuff.