iPads don't support notifications unless your family figures out how to use PWAs (they won't, Apple made sure of that). Also, there are various content blockers for iOS.
Unfortunately, because real alternative browsers are only supported in the EU (and even then with big asterisks), you won't see a normal browser engine powerful content blocking any time soon. The content filters you can download from the app store help, but they're not as powerful as uBO and friends.
They already have an iPhone, a Mac, a MacBook, which tablet would you recommend that integrates just as well? My point is that this is not a realistic option for a lot of people. Adblockers only work for people who have previously valued their freedom.
People always say this, but I wish they would suggest a specific one. There are so many out there, it's hard to know which ones are high quality, still maintained, etc.
The only other extension I’ve started using recently, when the quantity/frequency of YouTube ads on Safari became unbearable, is 1Blocker. It includes a specific filter for blocking YouTube ads, and you can use one active filter for free without subscription.
Baking Soda: https://apps.apple.com/ca/app/baking-soda-tube-cleaner/id160...
Vinegar: https://apps.apple.com/us/app/vinegar-tube-cleaner/id1591303...
Adguard pro: https://adguard.com/en/adguard-ios-pro/overview.html