Hey T.,
There is too much here to clean up in one response. So I will be brief and curt out of need for space. Please know my heart goes out to your family. And also that getting the whole family in counseling, son alone(already goes), you alone, you and hubby for marital, and then all 3 of you for family dynamics. Nothing long term, just 6mo - 1yr depending on the therapist's recommendations. I am retired from counseling and what I point out below would be only that of my opinion and based on the limited information you could provide in this forum.
You son: Has behavior issues that need to be addressed. He was 12 when you remarried. An age where adjusting is difficult due to hormones, adolescents and life, then add a blended family to that and bang. I would guess he would be angry. He has a diagnosis of ADHD. This really should only effect his energy level, ability to concetrate, comprehension, focusing on tasks and grades. His mood should not be altered because his having ADHD and his respect for parents and authority figures should remain. You should ask his therapist if he is also diagnosed with ODD. If so, then you would be in need of more aggressive behavior modification tools. And No! beatings are not the answer. It sounds like your hubby is one extreme and you almost the other. Somewhere in the middle may be needed.
You hubby: He has poor parenting skills and anger outburst issues too! Has he ever parented a child and a teenager? If your son has several issues, then resolving any of them, requires you both to choose your battles wisely with him, as he can't learn from the important ones if he is being nagged over little ones to the point that every little thing is the end of the world, he will just shut down and ignore all discipline. Depending on the severity of discipline concerns with your son, I would guess blaring the radio is not the worst thing and well it should never escalate to being thrown out. Your hubby should never think he has the right to kick out a minor, much less a minor that is not his child. The dynamics here, require you two to get on a united front for parenting your children and that anything major like removing your son from the home, be well discussed and agreed upon by both of you. Not done in an instaneous and well heated argument while you are at the store. Your hubby has a hot head too and would benefit from counseling where he learns more appropriate parenting skills that would yield him better results. Tell him that it is very normal to not know how to parent. (I personally with all my training have to work hard to stay in parenting mode too! It is very easy to get tired or irritated and want to just yell, or argue with the child. But then I have to remember I am not the child, but the parent. This does not mean I'm the dictator. Instead I am the parent, the adult, the teacher and the role model. I am the example I want my kids to grow into.) If your hubby can handle it, counseling alone for him may help alot.
The issues here are only surface. So again, I highly recommend family counseling as a unit but then also individual sessions. As for getting them to think alike, etc. This is not likely to happen due to life experiences and age. But you could try to get the whole family on the same team. So maybe a family sport or activity. One where no one can be bossy or condescending to another. Another important thing would be a physical activity that is not too strenuous, like light walking or jogging, done as a family. It would help to redirect extra energy, teach breathing skills needed for anger, improve circulation and breathing, as well as health for each of you. It also would increase the amount of good brain chemistry. I suspect your blood pressure would benefit the most. And the family would be together.
This is just one mini crisis in your family. And as time passes and you get further away from this event, you may feel inclined to go on with life and forget that the family is in need of some counseling. I know we are too busy and it seems hard enough to get the other stuff done, so finding time for therapy seem impossible. I can only tell you that it is important to get the skills you need by seeing a trained AND liscensed professional. Please make time for yourself, your hubby and your son to see a counselor. And also look for behavior outburst to worsen in the 9yr old and 5 yr old. They are absorbing all the poor dynamics they witness and will repeat them as they age if something doesn't change.
All I have done is pointed out the obvious, and hope that my bluntness gives you the ability to see that some professional intervention is needed. It can get better, so I do pray that you whole home and family finds peace soon!
Best Wishes and Many Prayers,
-MB
PS... this is nothing severe, YET. Your family is beyond normal and this is super fixable.