Original: She persuades her younger brother Jamie to accompany her: he's quiet, but most importantly, he has a secret stash of cash, which he's accumulated by betting on and cheating at card games with his best friend, Bruce Lansing, who is in the same grade as Jamie.
Simplified: She tells her younger brother Jamie to accompany her: he's quiet, but most importantly, he has a secret stash of cash he's gotten by cheating at card games with his best friend, Bruce.