Interpersonal relationships vocabulary

Hi,

I'm doing a research and I'm looking for words/expressions from any field of interpersonal relationships. Compounds, idioms, proverbs, metonymies and metaphors will be very helpful for me. I found a lot of examples (f.ex. black sheep, godfather, dark horse, soul mate, the better half, Clapton is God, the genius bar), but I need more. As You see, these examples are more comlex than a simple 'friend' or 'employee'.I'll be very gratful if You help me a bit