My partner & I have been invited to a 21st birthday party. His ex wife is also going as they are the girls God parents. I don't have a problem with his ex wife as she is really nice. But she wants to stay at our house the night as it is nearer to the venue. His two grown-up daughters and granddaughter are going to be staying also. I'm not sure what to say. I think it's weird but my partner is fine with it. What would you do.?