Here are some little-known ways to see if your kid is doing things and visiting sites you don't want them to:
1. They've deleted their browsing history. What are they hiding?
2. The ads showing up are questionable. Marketers use retargeting to get you to come back to their websites. So if you're seeing ads that make you go "hmmm," that's a sign they've been visiting those sites.
3. They hide when using the device. A good rule of thumb is NO devices in bedrooms, or in any room that is not out in the open.