Dogs tend to pick up behaviors from other dogs, good and bad behaviors. You have to teach the pup what you want. Wouldn't hurt to work with the others before pup comes home.
I could try that... but the oldest is 9 years and the youngest is about 5. It'd be a little difficult as well with my family being adjusted to how the dogs are now. The entire "I wish they would stop doing this" has just become a daily saying in the house but they don't follow through. I've also tried training them one-by-one but the rest of the family just de-trains them, if that makes sense.