If brought up and trained well a PBT can be an outstanding companion for any family situation. Whilst your familys respose is not uncommon, it is certainly an indication of misunderstanding the true nature of the PBT. Reality is that the PBT should always be outstanding with humans, regardless of their breeding history for fighting, which may present the possibility of dog aggression, the PBT also has a long history of human companionship and friendship.
If you bought from a really good breeder, who is able to proove not just physically sound animals but also tempremenatly sound animals, and a breeder that will offer you continual after purchase support and advice, you are starting with one foot forward already.
If your BFs family already own a wonderfully natured PBT, there is a good chance that with his knowledge and their support and understanding that you could very well repeat that same sweet natured companionship that they have with the existing PBT.
As far as your families reluctance, it is now the opportunity for you to educate them, and teach them that so often nurture NOT perceived nature is the best way to have a well behaved dog in your home. It might be worth them meeting BFs families dog as well, so they can see a sweet PBT at its best.
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"The purity of a person's heart can be quickly measured by how they regard animals" | 
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