Is it normal should i stay or should i go

haven't been to a family gathering in years because well I am kind of the black sheep of the family and I never did fit in . The older ones are dying out but never forgave me for marrying my husband and doing what I wanted with my life. And now the nieces and nephews who are in their 30's want me to come. I don't want to deal with my sister who is a very mean-spirited person. It is impossible for me to ignore her and how she treats my husband.I once pied her in the face because she just wouldn't stop harassing me.I am kind of sensitive but it is non stop venom with her.I would rather be in florida than spend Christmas here, But I don't want the nieces and nephews to think I HATE THEM. am I being selfish?