I know this is different for everyone but I wondered others thoughts. I have a teen and a tween with my ex. Ex has been with gf for over a year. Children met her and have regular contact for the last 6 months. Recently my eldest has mentioned dad says tween can stay with girlfriend while teen and dad go to a hobby. Or dad says gf can take tween to his hobby. My thoughts are that she isn’t their parent and dad needs to manage it or I can be around if things overlap?? Dad hasn’t mentioned to me and obviously I think it needs discussing. Just wondering how others manage this as it’s all new…