fengs aunt the one that help fengs grandpa fake disease (sorry my english is bad)
maybe not idk
At the begining feng and yi were fighting over Rourou since theyve accident put (I think) 2 sperms into the baby, so both of them became rourou's father. The kid right now was the aunt's kid, whom (I think) stole yi yun's sperm thinking it was Feng's sperm.
i've just checked something, I think it was only feng's sperm ended up sterlising the egg (since his genes are more dominant than yi yun's genes), I don't they've used 2 sperms. Either way it's quite confusing at the moment but it would make more sense in the next chapter
The baby is Rourou? Or wait? I read this really long time ago I forgot Abt it whose baby it actually is? At the last