If there is a family history of previous orthodontic treatment, work with your dentist and orthodontist as a team. Always remember that your dentist will evaluate the orthodontist’s findings and can arrange for a second opinion if deemed necessary. The most basic human right is to utter an opinion and vice versa have an opinion on the utterances of others – which may lead to further opinions being expressed! Thus, one eventually arrives at the truth.
It is no different in orthodontics – to treat or not to treat, when to treat and when not to treat – it is a matter of common reality that is established through effective communication and arriving at a realistic agreement. You as a parent can and should play a major role in this by careful observation and evaluation of the findings and then you should take responsibility for your decisions after you have been properly informed by the professionals. (This may involve more than one discipline and should be coordinated by the orthodontist or your family dentist.)
It is in your hands (and eyes) to make a difference!