honestly, it's all on the relationship. If there is arguing going on or you can tell that they're being distant for some reason, it's a clear sign that something is wrong and should either be talked about or that person your in a relationship with needs to get over there fit.
You don't. That's a bitchy thing to do, and you should just let people be happy.
Specifically for a family relationship, you can ask "¿Cuál es tu parentesco conmigo?".
say "stuff you."
Yes.
When you catch her in bed with your dad
If you are in a relationship with this person sometimes its best to end the relationship. Nine times out of ten this person is cheating on you and does not know how to end the relationship. They are hoping that you will get tired of the abuse and walk away.
no
Integrity...
If you're a true friend; you wouldn't end the relationship. If you're talking about a friends relationship with the opposite sex and you know something that would otherwise harm your friend. Then, as a true friend, you would warn him/her about such issues.
i don't know, soz
define "disconnected"
There is a reasonably strong positive correlation.