Who is Brennan Cole from Canyons and what is their importance?

Brennan Cole is a fifteen year old boy. Brennan likes to run. Brennan's home life is difficult. Brennan's mother is a single mother and she works most of the time, leaving Brennan home alone. When his mother is not working, she brings men home with whom she hopes to have a relationship, but they often end up breaking her heart and leaving her alone. It is this situation Brennan tries to avoid. Brennan does not like the way his mother seems desperate to have a man in her life and how she becomes depressed when a man leaves her.