"Really? That's pretty cool. Personally I'm not really good at painting myself; ham hands, you know? So what're you're talents?" He asked looking at Devon and Ivy. He hadn't heard Ivy talking about her talent.
@Zeroth Clans or families with long lines of Magestrava are more prone to having children that are, but it's not a given. Similarly, families with no history of magic can suddenly develop.
And no, it's a medieval-ish setting. I mean mutation in the same way albino's and red-heads appear. It's a natural genetic occurance, but rare and random.