They would either both be Rexes or (if the babies are indeed hairless) then they would be het for hairless. The baby in yor pic looks like a double Rex to me but it's not that clear of a pic. You should have a better idea in a few weeks. I own a hairless female and a double Rex male, and you can tell the difference. He is all patchy. Hair grows, falls (or breaks) off, then regrows in a different pattern. She is always hairless.