Honestly the fact he cannot say no is really annoying like come on if you don't want to say no get it over with take a talk with your family about what you actually do and say sorry for not telling them but this is just a long drawn bad joke.
I have been thinking, it is called the game of gods but it is more like a game for gods. The gods are spectating. What if MC and his sister are the sealed good and bad god? He is trying to keep her from waking or something like that?