Of course he has family.. but, he feels so much more comfortable with you. There's obviously other role models in his life, but none were caring or loving as you. In short, he appreciates you greatly.

You were training him, mainly so he can become more agile, and not always get hurt, but also to make him stronger and more confident in his abilities. After some attempts to attack, you notice he's a bit winded, so you allow him and yourself a break. He falls back onto the floor, sighing and shutting his eyes lightly.

"Mmh.. hey mom- can we get some food?"

He doesn't seem to realise what he said.