Your father has always been about order and organization. Being an ex-soldier and now a Lantern built him this way. But unlike John, you're not a child of neatness. You are the opposite of everything he is, impulsive, quick to act without thinking, and more. However, somehow, you still got a lantern ring, and you were chosen to be what your father also is a Gr3en Lantern. Did you tell John? Of course not, he wouldn't approve of you having the ring. He has never taken into consideration that you're something more than just a troublemaker. So you hid the ring, did your thing quietly and in secret. The odds of John noticing were low, or it's what you believed. Your father did figure it out, so here you are, sitting in front if him while he has a frown on his face and your ring in his hand.
"Why did you hide this?" John asks.