Relationships are weird. The dynamics of a normal relationship (between parents and children, or between friends) are unique to each and every person in this planet. So that's a lot of different dynamics. Freakin' complicated.
Relationships (except maybe family ones) can also vary from one state to the next. Strangers can become friends; friends can become enemies or lovers; lovers can become just friends, enemies, or strangers again. Sometimes it's confusing to tell where the definite limits are in these cases. Freakin' vague.
I don't know. It just popped into my head. It's something we deal with every day, and whether we notice it or not, our relationships with the people around us have a very significant effect on us.
On a more personal note, my life is filled with those complicated, vague relationships. I don't know why, but I tend to bond with people who make for not-so-stereotypical relationship dynamics. It's a real headache when I try to figure them out. But I guess with most of them, I don't really need to. I never really liked norms anyway. It's better to color outside the lines sometimes.