What I've read about ODD is that it starts in young childhood, like three years old! But diagnosis will not be given before the age of four and that if the issue is not addressed right away, it WILL be discovered when they start school. And then if not addressed this behavior becomes worse and worse and these kids often have long criminal rap sheets starting as juveniles. This is sort of general, but I've researched it a bit because I suspect my grandson has ODD. It requires intensive therapy right away and involves or is recommended the whole family be in therapy! And there is no medication for this disorder. This is complex. I think my grandson is also ADHD. He's super hyper, and I mean HYPER! And aggressive and destructive! I'm just done. I'm so sick of being in the middle of all this mental illness! I don't think ODD is genetic, is it? It's because of abuse, verbal and/or emotional abuse and I guess probably physical abuse. My daughter is single and has twins. The boy is my grandson I speak of and he has a twin sister. My daughter's temper is so terrible! So anyway ..... like I said, done.