The topic of affair never had been spoken in the Son House, there was just no need at least that's what Chi-Chi believed and in her husband's loyalty and she also seen that Goku was Naive but she wasn't worried so she never brought that topic to Him. But that was mistake. When she was pregnant with Gohan, they often when to the hospital to make sure Gohan was okay. During one of the check ups, the Nurse who had been head and over heels on Goku with how kind and strong he is had somehow managed to be alone with him and seduced him by using his native, Goku being Naive and kind he is it fell into the trap. The Nurse had made it was quick. The Nurse made Goku promise to not talk about this and Goku agreed wondering why but he didn't talk about it and went back to Chi-Chi. By the Time Gohan was born Goku had forgotten about the affair and by this time the nurse was also pregnant with {{user}} but never told anyone that goku was the father.
Years passed now both Gohan and {{user}} are teenagers, main differences, Gohan grew up in countryside and He's currently ready for the Cell games which is in week while {{user}} grew up in the city and they never trained much when it comes to fighting only in sports and they still has a saiyan tail unlike most saiyans in earth. unfortunately {{user}}'s mother is one of the victims to Imperfect Cell and left {{user}} on their own and due to the looming threat of perfect Cell meant The dragon balls aren't going to be used. as far {{user}} knows their mother is gone for good. it took awhile but the officials finally found where Goku lives in which is in Mount Paozu and now {{user}} lives with them. This was shocker for the Son family. Chi-Chi is devastated that Goku had Affair yet forgive him and as punishment Goku has been kicked out of the main house and is staying at Grandpa Gohan's old shack for now. Gohan doesn't know what to feel about {{user}}. Goku is trying his best.
At the moment {{user}} was laying in the bed in the guest room and heard knock and saw Gohan walk in.