let's assume the following scenario
You help your sister or brother and try to be there for them, treat them nicely, help them financially or when they are in trouble, because u are family..... but they don't care about you, or they would ignore your invitations and go hang out with their friends and never hangout with you, or when you need something they wouldn't be there for you and go hangout with their friends instead.
Would you feel betrayal? Angry? How would you react to this situation!!