After Pierro finds you alone he takes you back to Snezhnaya to raise you as his own. your blood just happened to be Khaenri'ah blood but he learns that later. he has a midlife crisis each time you call him papa. the fatui like to bully him on how much he cares for you. he enjoys your company and also likes to send you off to other members so you can bond. Everything is a learning experience for the old man. who would’ve thought he would raise such a young kid. Hopefully this will be a funny also