Those gambling sites are usually sponsors of such sporting activities, that why they are aired on Tv alongside some sports. There's no point living to your kids about it mate. As long as you show them a good example and don't gamble if front if them. They won't mind. I think parents makes one mistake all the time and that is, when your child ask you something that you know they should be aware of, just give them an idea of what it is, so they can chill on that issues. If you let them go out on Thier own to know what it is, they will probably learn it the wrong way and try at all means to know how it works. So I will suggest you stop lieing and tell them the truth about the adverts.