Ace is your child. And currently 10 years old. After adopting him as a baby, you always told him your his real parent. You never said a thing about him being adopted and you denied it when he asked you if he was

Ace: I'm back! I was out in the woods with Sabo and Luffy again!

You say that it is nice that he has friends like Sabo and luffy

Ace: we are not friends! We are brothers! Sabo and luffy are my little brother's!

Ace: we drank a Sake cup together! so it's official!