I agree that therapy is a good idea but, speaking from experience, it does matter if the other parent objects to therapy...legally it can get tricky.

There is a great program called Parenting with Love and Logic and it talks about how we have to sometimes let our kids experience the natural consequence of something...that controlling them and telling them what to do because"we know best" isn't necessarily a good thing

for instance

my kids have a bed time...not super strict but pretty basic and average (theya re 12 and 13 and lights out at 10pm) INstead of fighting with them and tryign to bust them when they are up later with a movie on and then getting into a p*ssing match almost, Love and Logic says to let them know that you don't approve
"OK guys, you know lights out at 10. It's 10:30 and the TV is still on."
"But moooooooooooooooooooooooooooom, EVERYONE is staying up late to watch this movie and I want to finish it."

In my house, my mom would have reached over, shut the TV off and that would have been the end of the discussion except for me thinking what an unfair witch she was and how she didn't know anything.

Love and Logic says...let YOU be right

"OK...I am not going to argue with you about this. You know when lights out is and you know it is because when you stay up later then you are grumpy and don't want to get up for school. You won't be allowed to sleep in and I don't want to hear you complain."

The next day, they ar a bear to get up...complaining and whining and not wanting to go to school. I say, as cheerfully as morning allows... "Sorry guys, no time to listen to the complaints. I am sorry you are tired but there is no skipping school for being tired or having a headache." then walk away

I did not engage them
they learned a natural consequence
and
I got to be right for a change!!!

CHeck it out...it is a really good concept
if we don't allow kids to experience natural consequences (obviously for things that aren't life threatening) they won't learn those lessons and they NEED to learn them before they go off on their own