Hi and welcome to the board. Are you adopting them? Have they had a chaotic few years? ODD rarely stands alone and pretty much means, "Ummmmmmmm, we don't know what's wrong." Also, if they are overly defiant and rage, it is likely they have a lot more going on than ADHD. You may want to do a signature like I did below. In the meantime I have some questions that can help us help you.
1/Have they ever seen a neuropsychologist? They do the best, longest, and most intensive evaluations. I recommend them above all others.
2/Are there any psychiatric disorders or substance abuse on either side of his genetic family tree, even if Dad hasn't seen him for a long time. Genes are genes. They get passed along even when the parents aren't around. Have they ever been abused? Abandoned? Neglected?
3/How was his early development? I'll list the areas:
speech
eye contact with strangers
cuddling
did he play with toys appropriately or did he dismantle them, throw them or line them up?
Any sensitivies to light, sound, noise?
Can he transition from one activity to another?
How did he and does he now relate to his same-age peers?
Is he socially clueless?
Any obsessions?
Any strange noises or hand movements (arm flapping, lip smacking, high pitched vocalizations, turning lights on and off)
How does he do in school?
Can he hold a give-and-take conversation?
Weekends are slow. Others will come along. __________________
Me, over 21, mood disorder (bipolar II), anxiety disorder, mild Obsessive Compulsive Disorder (OCD), NonVerbal Learning Disorder (NVLD)
Hub over 21
Son #1 31 severe anxiety/Obsessive Compulsive Disorder (OCD), Lamictal, Xanax, CR, doing well (nice wife too)
daughter #24 ex-drug addict, turned her life around, my best friend
DS #14 Pervasive Developmental Disorder (PDD)-not otherwise specified, adopted at age 2, super kid, may need some help as adult
daughter 12, Processing problems, Learning Disability (LD), social butterfly, big athlete, sensitive
DS 31 Adopted from Hong Kong at 6, for reasons unknown no longer wants to see us
Grandson-infant--Precious little Blue Eyes