My children play a popular online game with their cousin. They pay for a server out of their own money so they can play with close friends and cousins without me worrying about strangers. My ex-SIL has asked that they stop playing with their cousin at 8 pm as he needs to get to bed. I agreed as I would like my younger son to start getting ready for bed at that time as well. However, this apparently means that after 8pm, my children have to stop playing online as well, and if they continue playing with each other after 8. (weekends for example or holidays) then it is UNFAIR and I am not sticking to the rules. It is possible for my nephew to tell if they have played after a certain time the next time he logs on somehow. One of my children is significantly older and doesn't go to bed at 8.
This is one of many disagreements I am currently having with my ex-SIL about online gaming. I am happy to ask my children to stop playing online with their cousin to help get him to bed at a decent time, but I don't see why this rule extends to what happens in my house after this time. She has also decided that it is not fair that my children play online together when her son can't. There is a lot of context obviously but the bare bones is that my children pay for this space out of their own pocket money, why should she try to control when they can and can't access it.