Without asking your adult daughter (still living at home) how she felt about it?
So, the main bit of the story is when I was still living at home in my early twenties, my mum moved in a man she had met a few times. They'd met online and communicated long-distance. I wasn't consulted at all. I eventually managed to move out but i'm still so angry. He changed my mum and was awful to me. They literally ignored me when I was there. There was other things too but I can't comprehend how someone can move someone in so easily without the agreement of her own daughter then put the new husband first.