When people define their expectations in any type relationship (family, business, or dating), it helps to avoid some of the hurts feelings and misunderstandings that can ensue.
Something that I expect overall is consistency. Feelings can change easily, but overall there should be some things that do not change that often with a person. There are times when you change your mind about a person or a situation, but there should be a good reason. When a person changes their mind abruptly, or goes so far left that the change is too extreme (as in, extremely wrong), I have a problem with them.
One thing I am still learning, in various settings, is to be able to say what I want or what I expect from a person, without the fear of rejection or being shut down. Just because I want something and others don’t agree, doesn’t mean there’s something wrong with my request.