Irritating question

Why do people ask questions that they could actually ask to the person themselves instead of me???!!! It started bothering me, really...

I don't know how are they doing or so just because i know them personally, so i am not the right person for you to give such question like this:

xxx: hey, how's your cousin doing?
me: good i guees, i don't know i am not with him

which in mind i wanted to say: Oh God, how the hell am i supposed to know??? can u ask by urself??!!! We are related but if u r interested to know how is he doing just ask by urself!!! And you have his FACEBOOK for God's sake!! post in his wall or do something about it!!!

then he went offline

I am sorry if u don't like the way i answered your question but don't chat with me if only you wanted to know about how my cousin is doing when you already know that i am not in my hometown at the moment.