Scariest Thought

I think what I'm most scared of is being hurtful to my family in a way that I can't fix. I sometimes yell at my brother and mouth off to my parents and tell my sister that I can't wait for her to go to college but it's always something that I can fix. I simply apologize and then do something to reconnect with them. But what if I say something to one of my family members that makes my relationship with them so strained that I can't fix it with an apology and some reconnecting time. That would be the worst thing! (My brother is reading over my shoulder and told me that I would just have to buy him cheeze-its. So he's covered :) I wonder if that would work with my sister and parents if I did something to them)