You've just rubbed your screen. xP

Youhei's mother is unsure how to call Chi, and says that they should give her a name. The father says that's no good, since they need to give Chi away soon.

Mother is happy that Chi wee'd in the wee-box, so she giver Chi some milk. Youhei comes running by, saying that he needs to wee. This leads Chi to wonder what 'wee' is.

Chi keeps this in mind, and the next time Youhei says that he needs to 'wee', Chi comes along. However… Chi now thinks that her name is 'wee'…

Oh. Oh dear.

Since Chi now responds to, well, 'Chi', Youhei's family decides to call her that.

Thoughts:
Before I get going, those of you who haven't seen the episode may not know that 'wee' is pronounced 'chii' in Japanese. So all this time, they kept saying 'chii'. I was wondering when the connection would be made, since they kept on saying stuff like 'Chi needs to go chii'. xD