I am also a parent and I fear for my children just like you. I installed Refog Keylogger on my kids computer https://www.refog.com/keylogger.html this program captures and records all the activity of my children at the computer. I know what sites my children visited, what programs they used, and with whom and what they talked about on social networks
But I decided to use this cell phone tracker https://www.hoverwatch.com/ . Hoverwatch has been on the spy software market for a long time, and has already made a name for itself by becoming the N1 phone monitoring app. This is absolutely legal and reliable software that has won the trust of millions of users around the world.