[Mrmon2]

advise me some good ways!

[Cavin]

I would hide my new girlfriend from you too! Sorry

[Tomjor33]

Such an unusual question, but I can give you good advice.  You can install this mobile tracker  https://www.hoverwatch.com  on your son’s smartphone.  This tracker has many useful features, one of which is the automatic activation of the front camera when you unlock a smartphone.  This can help you see your son's girlfriend and stop worrying about it.