Unwanted

Jamie • 27 years, married with the love of my life. Two beautiful sons 💙💋😍
After i give birth to our second child i dont want my dads stepchilderen in the hospital cuz the first time they were really annoying. I already Told my dad but he says that its not up to him but his girlfriend... She is very very dominant and i dont know how to tell her without starting a huge fight. Any advice?