I'm the only vegan in my family. My oldest sister was a vegetarian a long time ago, but not for ethical reasons, but because "everyone else" was. My other big sister is a wannabe-vegetarian. A liberal pescetarian, sort of.
My parents are very supportive, and they let me cook for them and tells me how impressed they are with me. But it's still very hard for me to cook food in the same kitchen as them, when it smells meat all over the place.