I have mentioned on here before that I have a family member that has 2 "Pit Bulls" and has raised them around young children without any problems. I would not, however, let Gracie play with the two of them together. It's not that they are mean. It's just that they get very energetic when playing outside. The smaller female I would have no issue with letting Gracie play with but the 2 Pits together are just way to much for her to handle. If she got caught under their feet when they are playing around it could be a disaster.
There are so many people who are breeding Pits to have aggressive personalities that a person needs to be very careful where they get this breed from. The original breed of American Stafford Terrier is a wonderful breed but in the hands of people who use very poor standards for breeding stock the breed has become known as being very aggressive. Not all are like that. I would say the minority are bad but it only takes a few to ruin the reputation of a wonderful breed.