I just want to add, like someone else already said, yorkies are very attention-loving dogs who will follow you EVERYWHERE (don't expect to ever go to the bathroom alone again haha) and who crave human contact, especially yours. I just would feel so bad for a new puppy who is left alone for 9 hours a day everyday
Will your girls be home at all during the day to play with them since you wanted to get the puppy for them? I agree with another post, maybe its best you get an older dog so you don't have to worry about the hypoglycemia or that is already potty trained, although they still need/crave attention too