SIL visited us from US with my nephew (3) and is staying with us for about a week. The purpose of which is my nephew can play with my DC (3 & 6). I am supportive of the idea for the cousins to spend time together.
I think my SIL likes the good example my DC show my nephew. He is a fussy eater and SIL want my DC to help encouraging nephew to eat more when they eat together which I don't mind. But i feel it's bad influence to my DC in terms of ruining their routine. SIL allows my nephew stay up til really late and get up late in the morning ( and ask everyone to be quiet so as not to wake him up at 9 am) My DC refused to go to bed when they are playing with their cousin. They said why they need to go to bed when their cousin doesn't have to. When I insisted it just ended up with crying and screaming. Tonight when I want to ask my DC to go to bed, SIL invited my DC to have milk together with my nephew. It was already 11 pm. End up my DC went to bed at 12 pm! I know I should be more flexible about routine when there is visitor but 12pm is too much for me.
AIBU to feel annoyed? Any idea how to handle it better? The visit is only half way through and still have few more days to go. 