If you're going to cast two people who don't even look/aren't part Jewish/Roma, at least make it worth it.
So, if I get it right Wanda and Pietro have a Jewish father and a Gypsy mother...
But how do you "look Jewish"? Most Jewish people I know don't look any different from non-Jewish people.
And people who are "part Roma"... they look, for example, like Bob Hoskins, Charlie Chaplin, Michael Caine, who are all of Roma descent.