What if I confront my sister?
Why do you want to confront your sister?
I need to know why she left me out of an important event
It is not right to be confrontational to your family. It is best to approach them with some understanding.
I always take the high ground and the moral high road in the family.
That's good, and you shouldn't confront her about this. You need to be understanding at why they did what they did, and maybe just ask it in the form of a simple question.