Yes, those had to be step children. Humans and twii'leks crossbreeding? This isn't Star Trek!
Would've been really funny if they chose a less human-like species....Wookie, Gran, Ithorian, Rodian.
Oh, and what the heck was with the clone with the Republic symbol tattooed over his head and face? His helmet had the symbol, too. If that guy survives it to the galactic empire, he's gonna look like a wanker.