So from being 2 she's had him overnight once a week, when DD got to 8 months she had her overnight at the same time. She loves having them, it's them that asks to have them over night, I've never ever asked her or her wife to have them.
Ds is now 5 and DD is 2, their dad now has them all of the saturday, and my sis has them either saturday over night or all day sunday. I've tried to subtley change the amount that they have them, but subtley doesnt work and they get upset, which in turn gets the rest of the family upset.
How can I change the situation without upsetting my sister or her wife?