I think they're spoiled rotten adult babies because their dad has never said no to them.
What actions did they take that makes them spoiled to you?
Because during public holidays I went to their offices to find them. They have suspiciously left the office together in separate cars. It scares me to think that I'm being used in some kind of deal between them.
That could have been a coincidence. If you feel that strongly about their behavior why not try talking to them about it?
That's what I thought. They both think that the world owes them a living.
Well you may need to talk to them and let them know that people have issues with their behavior. That way they can know that the world doesn't revolve around them.