Boy's Best Friend.Brian begins dating a shoe store clerk named Holly and bonds with her young son Kyle as he helps him build a pinewood car for an upcoming derby. However, Holly eventually breaks up with Brian in order to date other people, meaning that he and Kyle cannot see each other anymore. After encouragement from Stewie, Brian decides to attend the derby, but arrives too late and finds that Kyle has finished next to last. Still, he and Holly are grateful Brian made an effort to show up, and Holly allows Brian and Kyle to continue being friends. Later, Brian agrees to babysit Kyle while Holly goes out on a date...