"Moyini" just an endearing name. Just a personal nickname that Rafa has tagged to Carlos.
They are very very close according to Carlos in many interviews when asked about Rafa and vice versa.
And yes Carlita, if so Flavia is very smart! There is probably some very manly stuff going on in that room during playstation.
I got Rafa's biography here and there are some cute pics in there from lil Rafa and Carlos
And oh yeah, Flaaf is very smart not to be associated with them when they are being boys with their toys
although she might give some of them a run for their money