Sometimes people hide their identities because it keeps them safe from harm. I know back in my world most mutants have to hide, especially the younger ones because people are not really fond of people with abilities. Sometimes it doesn't matter if you're good or bad because people who don't have abilities tend to label you just because of what you can do. So it's great you have a world that isn't like that and you can be open. I was a special case on when I got my powers. Most of ours don't show their abilities until their teen years and usually happens because of something stressful, triggering it. When you have a human parent and a mutant parent, it can go either way, but when two mutants have a kid it's higher for them to get the power though always the chance it can skip. If that happens with my daughter, I'll still love her no matter what.