wrong. There are no identical twins who are brother and sister. The boy is XY and the girl is XX, therefore they cannot have the same DNA or be identical
I knew someone would say that. I overreach sometimes. However, there is no such thing as male vs. female DNA. It depends on which parts are activated by proteins. I’m not a doctor, I don’t even play one on TV, but you can’t tell me that males and females have different DNA.