7/30/2014 - Juju's learning Japanese

In Japanese, Papa means Father (Oto-san), but Juju calls his grandpa = Papa 
Now Juju is learning Japanese and he is totally confused Japanese naming convention 
Juju said ....
Dada = Ojiisan (Wrong! Dada is Oto-san)
Papa = Oka-san (Wong! Grandpa is Ojiisan) 
Mama = Gowo?? (Totally wrong. I have no idea what Gowow is??!! Mama is Oka-san)