Is it rude to be assertive in somebody else's house?

I'm a guest in family's house & they keep making me do things I don't want to do. They make food for me off my diet schedule, they plan for me to go places when I'm trying to work or exercise, and I don't know if it's rude to say no if I'm a guest, especially since they're... show more I'm a guest in family's house & they keep making me do things I don't want to do. They make food for me off my diet schedule, they plan for me to go places when I'm trying to work or exercise, and I don't know if it's rude to say no if I'm a guest, especially since they're critical of every little thing I do.
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