Who is Dopey from Haunted: A Tale of the Mediator and what is their importance?

Dopey is one of Susannah's stepbrothers. He is the second oldest of Andy's sons. Dopey is Susannah's age so he is about 16 too. At the pool party to which Susannah goes, she finds out that Dopey sneaked out of the house from being grounded. He is at the pool party, in the pool house, making out with Debbie Mancuso. Susannah is looking in the window of the pool house to verify it is her stepbrother when she falls into the bushes that end up giving her poison oak on her hands.