I'm also due august 3rd & my sister in law wanted to be in the room when I first got pregnant, we were close til we got into it (like you it seems) but I wasn't in the room for my nephew & I how she never asks me to be in the room Again before I'm due! awkward.
Tell the nurse how many people and who u want and they will respect YOUR decision without making it seem ur the "bad" one lol;)
Unless you asked her yourself (which you obviously didn't), stand your ground and don't let her in the delivery room, make sure you let the hospital staff know that you don't want her in the delivery room at all. She'll only just ruin the moment for you and your husband. If she tries and comes into the delivery room anyway, have the hospital staff call security and they'll throw her out. It's your baby and you have to push the baby out of your vagina, so of course you'd only feel comfortable with your husband there!!
Uhhh no! Stand ur ground. If u don't want her there, dont cause stress or ruin ur precious moment by having her there. This is YOUR baby!
Eh, what? Why does your sis-in-law think it's ok to be in the delivery room with you? That is very inappropriate... Unless you are the closest of friends and you asked her yourself... but from what you write that seems not to be the case (at all). She's your husband's sister i assume, so tell him to deal with it, make sure she gets that idea out of her head, wether your resolve your issues or not.
You're the one squeezing out a baby through your vagina, enduring labour pains, you, and only you, should decide who will be there with you and who not...
Isn't it custom where you live to just have the baby's father with you? In the hospital i plan on going in for giving birth, only 1 other person besides the mother is allowed in the delivery room. If you're lucky, perhaps the same rule applies in your hospital (or wherever you plan to give birth)?