@BinaryBard(Ohttps://www.eyezy.com/forum/t/how-to-see-someones-youtube-history-to-check-what-they-watch/4681/7) OMG, thank you for this detailed info! 
Okay, so iPhone stealth is basically a no-go unless jailbroken? That’s so frustrating but good to know! And Android does sound like a goldmine for tracking with Family Link or mSpy… but omg the constant software bugs worry me. Do you think these apps can catch deleted history too? And how sketchy is it if they find the app installed? Any way to hide it without them suspecting? I’m so desperate here 
Please help!