Its worst with relatives, I just can't say "no" to my dad. Anybody else i can either tell to call me later(if he is my friend), or to get lost(depending on my mood, I may say this politely).
My dad is a reader - if there is a problem he will read everything on the screen over the telephone - even if it takes an hour. It is absolute torture to help him (or my mother). But then again, an hour of IT- waterboarding is a small price to pay for someone who changed your diapers.
I'm thinking about changing my number.