Family & Friends

Why are they doing fun stuff without me?

My older sister and her three kids came here from out of state to be with her family. She moved into the family house with me, my parents, and my brother. Lately though I've noticed my brother and sister and her three kids disappearing from time to time to do fun stuff like going to the beach, carnivals, museums, buffets, and much more. But they never invite me. This make me feel very left out and unloved. Why would they do this? I want my sister to feel welcomed so I don't say nothing to her about it. And my brother just gets loud and defensive if I confront him about anything. Should I confront them?
Why are they doing fun stuff without me?
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