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I have to laugh at how silly the dad shit is, how dedicated/offended each side gets while most don't even care about it either way. Even Mori. She actively says "I'm not your dad" and apologizes to Deadbeats who think it's weird (it is) but she also acknowledges it's harmless and she could think of worse things to be called. It's just a bad joke some people refuse to let go of. Nothing more.
So when it comes up on Coco's stream, Mori will probably say similar. "Some people mistake me for their father. I don't know why." then follow it up with a joke like "If you keep acting up, you're going to be grounded."