I agree with aceman67,
Its just sibling rivalry, I have an older brother who is evil incarnate but I just can't kill him for that, now can I?
We just have a (love-hate) relationship, We love to hate each other lol
but blood it thicker that water so I would not with to part ways with him,
but on the other hand I could get him to beat up my worst enemy...
so we all have to get along with our family