Hehe, its a common mistake, Momo has a brother who plays pro footie, so understandable to assume thats Moussa.
And Zizou's kid is half spanish to begin with (his mother, the one took Zizou away from us...

), and grown up in Spain and lived there for almost his whole life, bit like a case of Bojan (Serb former pro father, spanish mother). But yeah weird when his father is Zizou and aint playing for ze frogs, hehe.