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My suggestion is to make things you can add meat to in the case of your carnivore holdout family members. You can always brown some hamburger and add it to the bean burritos at the last minute, for instance. Or cook up a big pot of noodles; they get one sauce and you get another. Or make a batch of rice and add stir-fried bok choy to yours, beef tips to theirs. That type of thing.