I have sisters and brothers and we are all very close now as adults and I'd consider them some of my closest friends. We still argue but on the whole are very close.
However! We were awful to each other growing up! I don't know if it was a normal level or beyond that but I remember my one older brother being awful to me and in turn I was so horrible to my younger siblings like I vividly remember being so cruel (I'm very ashamed of this and didn't fully grasp what I was doing at the time) I think we all had negative long term effects on each other. In fact my dad once told me I was to blame for some of my sisters problems because of how I treated them when we were children (which again I am so ashamed of and upset by).
Anyway, long story short, I have two young kids, 4 and 2 and I notice they are starting to be mean to each other, well the elder one to the younger and I want to intervene and stop it always. My DH says you need to just let down of it go.
Can I make them be friends? Be kinder? Will they always sneakily be mean? I remember how cruel siblings can be when alone. Is it just all part and parcel of having a sibling?