ADD and ADHDs Role in Genetics

Patient: Hello,I am a female, one of three siblings. I have two brothers. One has been diagnosed with ADD, while the other with ADHD. I would like to know how likely it is for me to pass this onto my child, (lets say if my husbands side has not been affected by this condition). Since both my brothers have it and I don’t, I’m guessing I’m a carrier. Moreover, we cannot figure out how it is they both have it considering both my mother and father’s side of the family have not been affected by it. I would just like to know what my child’s chances of acquiring this are, roughly. Thanks!

Symptoms: Hereditary, genetic concerns