Everyone thinks that both Usagi and Chibi Usa HATE eachother and want to kill each other. Even though they both get on and jump on the others nerves, they do care eachother and share a hidden bond which can only be shown when they really want to show it. Well, more like Mother Daughter bond.

Usagi was extremely mean to Chibi Usa when she was staying with the Tsukinos. Usagi bossed her around and throwing all kinds of threats to the little spore. (j/k about the spore thing!)

Chibi Usa isn't innocent either.Chibi Usa pulled on Usagi's hair and went through Usagi's stuff looking for the crystal and I'm sure other things as well. Chibi Usa also gets Usagi steamed when she would hang out with Mamoru and get goodies from him.

Besides these wild cat fights they end up in, they love each other. Usagi and ChibiUsa have both looked after the other one incase harm were to fall on the other one.

Usagi has set as a role model for Chibi Usa. Chibi Usa wants to become a lady and has become jealous of Usagi's figure. Chibi Usa has also become jealous by the fact that Usagi has a boyfriend who loves Usagi with all his heart. ChibiUsa has also been a little copycat by copying Usagi's moves and sometimes feelings toward things. I guess you can say like Mother like Daughter.