When I looked after my grandson, then aged 12, I tried to limit his time on his ipad, x box etc. One day my son said he should have a limit of 2 hours, and we should go out to the park for some of the time. My grandson, who is on the whole a pleasant, polite child, just would not stop playing on his ipad, every time I gave him a deadline he wanted to ‘just finish’ the game he was in. Eventually he put it down to get something to eat and I grabbed it and hid it. What did he do? Go to his room and start playing on his X box ( whatever that is) . In the end I turned the electricity off at the meter and told him it was a power cut. We finally got to go out and he became a normal person again for a while. When my son came home he was not amused that various things on timers were disrupted by the loss of power, and thought I should have been able to control my grandson better.. It blew over quickly but I would never bother to try and stop my GC from being on his ipad again. When I visit he is on his ipad, son watches sport on tv, neither wants to talk because it is ‘interrupting’ what they are doing. DIL goes out to yoga etc and I don’t blame her, She makes an effort to be sociable for a while after dinner, then goes to bed early to watch what she wants on the tv in the bedroom. Frankly I don’t see much point in visiting them anymore. The only time we all socialise is if we go out for a meal - but whatever sort of restaurant we go in all they want or will eat are pizzas or burgers! If this is modern family life it is very sad, no wonder there is an increase in mental illnesses and obesity, since watching tv is not social or fulfilling in itself and is usually accompanied by endless snacks and drinking. It was not always like this, at one time they did make an effort to play games and do something different.
For myself, I have no option but to read my kindle when I am with them.