DB has form for rushing into relationships. He met, moved in and started a family with his STB ex-wife within 12 months. His close family members (including me) could see that she was trouble. We kept our mouths shut as much as we could but it was difficult as our DM (who was terminally ill at the time) was being pushed out of his and DGC’s life by his wife. She subsequently cheated on him with several people and they eventually broke up about 12 months ago. Since then he has bought a new house (after she took 50 per cent of the old one despite paying nothing into it) and a new car (as she got the family car even though he bought it with an inheritance he got from our DM). I was really happy that he had made a fresh start. However, he has begun to see someone new and she is constantly putting posts on social media that they are going to be moving in and be one big happy family together (she has two DC’s and so does he). However, this talk of moving in is before their DC’s have been introduced to each other or even to their parent’s new partner. This seems crazy, particularly in the case of my nieces who have had their life turned upside down once already this year and, in my opinion, need a period of stability. Should I raise my concerns with him, or keep my mouth shut?