I found out about ODD today and it perfectly fits younger sister, just two of us. I'm 42 and she is 37 now. Wish my parents would have had these resources years ago, but I am happy to see that they are available for families now. I'm actually looking for support with dealing with my sister and the negative impact her problem has caused me. I've only found 1 article on the impact of ODD on siblings, and interestingly all the ODD children were boys. Actually that's frustrating, makes me feel more isolated, but anyway... Wish you all the best and if you have any links etc I would be grateful!