Private flight departments can be very interesting.
One time, long ago, whilst I was managing just such a department, the local area manager was complaining about our one rest day, per week.
SO, I called the boss, IE the chairman of the board of the parent company, and asked him to intercede.
He did so.
His words to the local area manager were..." you don't manage the airplane, the Captain does.
The rules are,
1. The Captain decides.
2. If in doubt, see rule number one."
Never a problem again with the local area manager.
NB.
The company was on the Fortune 100 list of the largest companies in the world, and the Chairmans name was on the side of the building.
His company, his rules.
'Bow tie' Bob Fluor was a class act.