Get to work: question about human-alien hybrids

Perhaps my question was a bit confusing. I was wondering about children from one alien and one human parent, that have an alien skintone but are not full aliens. Looking at the comments so far, they are apparently just regular sims with a different skin tone.

I just had the chance to do a little test ingame. As far as I can see, they can become spellcasters without problems. So I assume the same goes for vampires and mermaids.