Add another one. When I was a little kid, it was OK. Didn't know anything different. But now that I'm a parent, I'm just amazed when I see the interaction and realize how much I missed. To experience the "I hate you!!" screamed at you, then 5 minutes later that same person is your very best friend who'd go to the ends of the earth for you (just probably not admit it. In all honesty, it should be experienced by everyone-I hold grudges and am much too sensitive as an only child.