My in-laws are a nightmare with phoning. They expect everyone in the family to have a phone welded to their ears. Let's say, a small every day thing is an urgent you must do it now request.
If we don't answer one of our mobiles, they will then phone one of the other phones, the house and even the kids. My sister in law can't have her phone with her when working, so is out of contact. Well they leave message after message, call after call when she gets back to her phone. They literally expect everyone to be available 24/7.