To my knowledge, my parents didn't gamble, and I don't know their stance on gambling because I have never heard them talk about it. But whatever their stance may be, it never had any role whatsoever in my gambling — just one day I made a bet on my own will that's it.
Most of us have this experience; it's not as if our parents stand against gambling or if they are with it, but the fact that they don't talk about it makes them appear neutral on the matter. We can then choose which way we are to follow; if we are to get involved in gambling, it should also be left with us, either to share it with them or with the people close to us.