"I'm not on homework watch," he answers, smiling. "I was just curious. Though, I guess I'm always technically a little bit on homework watch when I'm here."

Marcus never seems to be assigned specific duties unless there's something going on. When he's here, he fills whatever role he finds empty. Sometimes he helps cook and clean, other times he does homework, sometimes he's just an ear for a child who needs to talk.

"I just like talking to everyone," he says. "Besides, Dan would be disappointed in me if I didn't at least say hello to you."