[massphatness]

This is a difficult one, Mike, as you may not be able to dictate what dad lets happen at his house. It's going to come down to the relationship between your step-son's mom and the dad. Will he respect her wishes on the subject? If not, there's almost nothing you can really do. As a divorced parent (who btw has an excellent relationship with his ex), I can tell you these kinds of things come up more and more as the kids get older. Ultimately, you have to learn to pick your battles. Maybe the dad will listen to reason, but you may need to be prepared for some kind of compromise on the matter.