Been separated from ex partner for nearly 4 years. We have an 11 year old DD and twins aged 5 (DD and DS.) Ex and I have a fairly good relationship with no issues and get along well. He has been seeing someone for a few months. Yesterday he advised that his girlfriend and her child would be staying at his for a few nights when he has the kids, so they would be meeting his friend for the first time. I have no issues with them meeting his new partner, but suggested he might want to have a chat with our eldest first to make sure she knew about his friend being there and felt comfortable (he's not actually mentioned it to DD.) She's had anxiety issues in the past (CAMHS involvement) and I think she should be aware this will be happening and not just have it sprung on her when she arrives. Also feel it should come from him so he can answer any questions she may have. I also suggested it might be better to have a couple of introductory meetings with the kids first so they can get to know his partner before overnights happen where their dad is sharing a room with new partner. Twins are awful sleepers and will often go into mine or their dad's bed during the night. I feel really uncomfortable with the thought of my children sharing a bed with their dad and a woman they have never met before and told him this. Am I being unreasonable in making these suggestions?