I'm tempted to ask what our response will be when we are gambling and our kinds come to ask what we are doing. Do we lie to them or tell them the truth. At a certain age children become so inquisitive that they ask questions virtually in everything they see us do.
It is normal to a kid asking what are their parents doing in front of their devices, it's their curiosity that why parents should know their responsibilities. Parents should check their children's social accounts as well because gambling products and opportunities is more accessible now than before, children are getting the ideas from the advertising or by hearing some words from the adults so one way to avoid normalizing gambling is to set the example to your children by not gambling yourself or at least do not gambling in front of them. Be aware that kids are being exposed to gambling through advertisement so it's better to start a conversation with them and discuss the risk associated with gambling.
It’s very hard to check every activity they are doing now that smartphones is very common and it’s easy to browse this kind content by just browsing on the news feed. I think it’s better to educate them earlier on what to avoid so that you can implant a warning message on their mind before their curiosity makes them do their own research towards gambling.
It’s way harder to restrict children nowadays compared before because technology makes everything very handy even accessing website that was supposed for adult by just clicking the yes button when ask if you are a legal age for a mature content website.