No normal siblings really get along that well, to start with, and when your only sibling is “totally nuts*” it’s impossible to achieve. Which is why I wasted too much time and energy trying to build a loving sibling bond with people I didn’t particularly like and/or had absolutely nothing in common with but a few strands of DNA.
I almost wish I went to a therapist so I could send them the bill.
*A professional social workers words, not mine.