If you visit Coppell often, don't hesitate to PM me as I still live there. I'd gladly show you and your son some of the best spots in Coppell. Andy Brown is a little tough after the huge construction effort. It got rid of a lot of natural cover and the bass don't relate to any certain spots anymore. The canal system that feeds into Andy Brown is fair but pressured heavily for largemouth bass. Skip the canals immediately upstream of Andy Brown, as the one that feeds directly into the main pond was entirely drained 3 years ago to make the "spillway". The two sections near the Coppell Library are the good ones; very shallow and you can often sight fish in the warmer months. Lot of middle and high schoolers fish those canals. If your son is very young, and prefers easy fishing, there's a small duck pond by Townlake Apartments which is absolutely infested with panfish. Not large, but you can easily sit down and catch 20 or 30 (very) small sunfish in as much minutes. Powerbait crappie nibbles or hot dogs on a bobber is a must if you do decide to go that route.
GET THE NET