Matilda was white but her parents weren't
I'd call them Daego. I know Danny Devito wanted to star in this but he should have at least hired a white wife to make the parentage believable.
shareI know this is really late in replying, but for the record....
Danny Devito is Italian-American.
Rhea Perlman was born into a Jewish family of eastern European descent (Poland, Russia).
Mara Wilson was born to an Irish-American father and Jewish mother.
Matilda doesn't look anything like the Wormwoods, that is true, but I think that's part of the point of the story -- how much different she is from the rest of her family. The movie makes no mention of her genetics, and neither does the book.