CL - it is okay not to care like you think you "should", I think. I think there is a lot of propaganda around the notion of family and sibling love that is simply not reality for many if not most. I try not to buy into the fantasy as it makes me feel bad about the reality.

Seeing actual 5 yr olds does not make me have more empathy for me. It horrifies me that I was ever like that and I want to club it out of me even more.
Note: I do not club the small children of others and really only have the urge to club their parents if stuck on airplanes or movie theaters or dining out around them.