The movie is not very good, it's typical Ed, Edd and Eddy. I mean it has some seriously funny as shit moments but outside of that it's more of a mindfuck than anything else.
Yes you get to see his brother but I'm going to lay this out on you guys now. (I torrented it a loooong while back so I kinda already saw it) Anyways..
You see his brother in the LITERAL last 5 mins of the movie. He's not a main chararter, and has a few lines. Yes he ends up being a dickfuck, but we all expected that anyways. The movie is a B-B+ at beast.