That is rather odd that your family would have the same or similar dreams. Perhaps they'd told you about them at some stage and that's the only reason you're having them?

Either way, here's the thing, it's not real; so it can't hurt you, but if you do learn to become lucid — which can take months, not just a night — then you'll be able to either a) kick his arse or b) ask him what his deal is.

The dream you had where you had some control doesn't sound like lucidity. If you know you're dreaming, then you're lucid and can choose what to do. But keep it up. Read this tutorial — it's full of awesome advice — and go from there.