Crewing and crew management and coordination
Employing a pilot to fly your family is not the same as hiring a driver. First of all, you need two. Pilots are highly skilled and educated people, but it's not the only important thing, attitude is as important - pilots must be able to cope with unexpected situations, think and most importantly apply common sense (which is called airmanship in our world). Not only we need to find highly capable people, but even after that, we need to train them in accordance with operator's procedures, which usually differ from other operators.
All crews need to be coordinated in order to be at right time at the right place, having rested enough and generally be satisfied with their lives to do their job properly.