Not true though.
That sounds like a personal problem unrelated to everyone else. Do you want to talk about it?
Tfw that part where she was caring for him like a single mother was actually better than most of the show.
Haruhi's great with kids though, and has a motherly side (taking care of sick Yuki)
Imagine if she had a child
Regardless of the situation, siblings kinda help each other out. Perhaps not in your dysfunctional family, anonymous, but in the typical, normal family they do.