If you are tired of being bombarded by all of the internet advertisements online then you should give Pi-hole a try.
It is super simple to setup and get running. It not only blocks advertisements but also many sites that you might prefer your kids not see. With the ability to white-list or black-lists sites you can really fine tune things to your needs.
Since the blocking is done at the network level you are able to even block in-app advertising.
I recommend setting things up to cover your entire network. This requires a minor change in your router to point your DNS to the IP of the Pi-hole. It is nice to know that your entire network is instantly covered.
So far I haven't seen any negative effects or running Pi-hole. Our connection speeds have not suffered and no one in our home has had any issues with things getting blocked that shouldn't.