There are many myths related to marriage and family relations. I've always liked this quote in regards to marriage. I feel a lot of people expect the person they marry to be perfect. No one is perfect. It's always better to look at the good in someone and to overlook mistakes they make. No one is "the best" or "your soulmate". Simply look at the potential of the person and believe that it will all work out. 

Within family relations, people might also think that their relationships with their children, spouses, and siblings should be perfect. That is not true. I know that my own family is pretty great. But we are not perfect. We have to learn to get along and do the best we can with what we've got.