What does family mean?

As the boy blurted out what was bothering him, the topic he so wished to discuss, Grimshaw's lip twitched exposing his duplicate, longer canine more than it already was. It wasn't but a moment later when he continued, and continued, and continued some more. All it was doing was irritating the larger boy and he couldn't help but posture himself defensively. Who was this brat questioning him? Didn't he ever stop to think why he was adopted by them? That perhaps he didn't have any other family and wanted nothing more than his own family back? That no other family would be the same as his own family? It took great restraint to not erupt like a volcano on the boy, but he couldn't hold back all of it. His temper was too strong and he hadn't learned how to control it yet.

"Who do you think you are?!" He started with a snap, his teeth clicking together into a snarl. "Did you ever stop to think about why I was adopted? That maybe something happened to my actual family?" Grim was raging now and took a step forward towards the boy. "Would you want a new family if you were the reason your family was dead?! How would that make you feel, hm?" His silver eyes was locked on the slightly younger boy and his muscles quivered as he held himself back from lunging at him. He didn't know how to fight and certainly this boy did, but he was itching to shut him up even if it meant making him hurt. Maybe then he'd understand.