The heck they can’t! Mine sure did ask me questions, forbid me to go to certain places, not to hang around some bad influences, made sure they knew where I was at all times. It’s called being involved in your child’s life and having severe consequences for lying. Phoning to make sure you are where you say you are. I was raised strictly but for my own good. There is no way SS could hide an entire 23 year old boyfriend and if they were okay with that, it’s disgusting for the parents to have allowed it and for fhe 23 year old to be essentially a pedalo.
you know what my parents did the same….but teenage me couldn’t actually give a tit about lying to them even though there were severe consequences
you cannot know what your 17/18 year olds are doing every minute of the day (although these days it’s easier with all the tracker apps around!)
they need to make their own mistakes and live their lives.