I just want to add that you are in control of your treatment. My first GP was my physician for many years, but his response to me regarding ADHD was unacceptable. I need to know that my doctor will listen to me and my concerns. I found a new GP physician who listen to my concerns, took them seriously,

Your treatment options should no be limited by what other family members have,IMO. One assessment done by a T who saw you once and just gave you a computer-based test, provides just one piece to a very complex puzzle.

be persistent.

I would recommend finding another health care professional who has experience dx and treating ADHD. I would not lie but I would have this person assess you without disclosing a lot of the family baggage.