This is an update to this post i made.

Today i told LS that we are keeping Vivi. I know a lot of you told me to tell him right away but i still had my doubts, but Vivi got sick yesterday. I took her to the vet and she was tested for parvo, thankfully it is not parvo. Still she has been really sick, refusing to drink or eat anything, diarrhea that then turned into bloody diarrhea and vomiting. She has some worms and the vet told me to keep an eye on her and to bring her back if she keeps vomiting or if she still seems weak. I've been feeding her baby food and i also got some pedialyte to help her. This is when i realized it was time. I needed to tell him. I am nursing this tiny puppy back to health, worried sick about her and i just needed to know she will always be mine. So i called LS over. I told him we wanted to keep her, that she is attached to us and we are attached to her. I told him he could still visit and he can even take her over to his house once she is older but that she will be our dog. I also told him we changed her name to Vivi. He was very understanding about it all. He said it made sense for us to keep her and that at least he knows she'll be in a good home. He also asked why my husband didn't tell him in a "man to man" talk. I told him it was because i was the one in charge of the dogs not him haha. So Vivi is 100% mine now, and although i am still worried sick about her being sick she is starting to get better and i know all of this will be worth it because she is already such a great puppy.

Thank you all who advice me on the right thing to do.