By being targeted by a future Slayer's psychotic vampire twin, getting the shit beaten out of him and finding camaraderie through shared hatred and the need to stick together.

"...I guess I don't, really. Not yet. Zuko wants to do a blood-rite with me and Katara, and Aang was made an honorary member of our tribe a while back. Mel won't do the rite, but she's practically our sister anyway so..."

He trails off and then blinks at her, smiling sheepishly. "It's kind of a weird family."