Couldn’t he take his father’s allowance away?
He did kick Vernon and his new wife out of his house.
At first they were living with Elvis in the house at Graceland. After Elvis’ mother died, while he was still in the army, Elvis gave strict instructions to the household staff that NOTHING of his Mothers things were to be touched or moved.
After his discharge from the Army, he returned home, but soon had to travel to California to film his next movie, GI Blues. After filming, he returned home from California only to find that Dee took it upon herself to redecorate the interior of the Graceland house without Elvis’ knowledge or permission. It was his mother who previously decorated the house, and now all his mothers decorations were gone. Replaced by Dee’s decorations.
Elvis flew into an incredible rage. He ordered the household staff to stay where they were. They could hear him going through the house, ripping down and destroying all of Dee’s decorative touches with his bare hands. The very next day, a truck arrived at the house, Vernon’s and Dee’s things were piled into it, and they (and Dee’s kids) were moved to another house off the property.
Though Elvis still kept Vernon on his payroll.