Rinnegan-based power help
Hello everyone. Fare warning, my English is not that good. As you have seen in the title, I am asking for advice and help for creating a fanfiction story I am making. It's a Rinnegan-based power (Inspired mostly by Pain) and I currently stuck on how I can show or how I can explain how it could be passed down (eye/Rinnegan) from generation. I thought of maybe by genetics or DNA? I had an idea that if an Asura reincarnate and Indra reincarnate (male and female, of course) would have had a child, would that child acquire the Rinnegan later in its life? Since their DNA and chakra would be combined into one and passed down and inherited by their child. That's my initial idea on explaining it first. I don't know if that would work, but where else do I ask if not Naruto enthusiast. Thank you to whoever answers.