ADHD has been identified as having an 85% heritability index, which is incredibly High and indicates that if even only one parent has ADHD, it likely that the children will have ADHD. I have a wife who’s family has a number of family members diagnosed with ADHD and she probably has it ,too (I’m not supposed to evaluate or treat family members and as a smart old husband, I’m aware that its probably better for her to decide she’s got it than for mer to say it.) We have three children, two of them have ADHD. And honestly I’m not sure that my family doesn’t”t have ADHD. I think both my brother and my father probably do. SO, it’s not that ADHD runs through your family, the important think to keep reminding yourself is that it’s genetics, it’s not anybody’s fault. It’s also not because of poor parenting.