AITAH for refusing to let my sibling move in after they mocked me for years about my career, but now they suddenly need my help?

Growing up, my sibling constantly made fun of me for the job path I chose, calling me a “failure” and acting like I’d never get anywhere. Fast forward a few years — I worked hard, saved, and now have a stable place of my own. Suddenly, my sibling is struggling financially and asked to move in with me. I said no, because honestly, I don’t feel like helping someone who spent years tearing me down. Now my parents and relatives are calling me “heartless” and saying family should always help each other, no matter what. I feel guilty, but also feel like I have a right to set boundaries.