How do I get my male dogs to get along?? HELP!

Question
I have four male dogs and three females.  All have been trained and shown in conformation events.  They all got along while at the shows.  Two of the males were living with my daughter until 2 1/2 years ago.  When we took them back into our home the males starting fighting with each.  I had the two "new" dogs neutered shortly after they came back home.  I also had the oldest male neutered almost a year ago.  The fighting is mostly between the oldest male and the two newbees.. They go after him.
How can I get them all to get along like they used too... I'm DESPARATE to get harmony back into my household!

Answer
Hi, Blusco,

Thanks for the question.

In order for me to have a better idea of what's going on, please give me the names, ages, descriptions (physical and emotional), and background of all three dogs, along with what they eat, and how the fights start, whether there's actual biting or just a lot of snapping, lunging, and wrestling but with no blood.

Also give me an idea of how much hard vigorous playful exercise these dogs get every day, and whether you ever take them on long walks together.

Thx,

LCK