I just use "Mom" and "Dad" but since me and my dad have a fairly informal relationship I call him "idiot" once in a while, such as when he asks how to send an email. Or make me go to the bank (Dan that reference was for you).
I know I'm a terrible person.
Eric SHUTUP you're going to the bank and that's final!
I address my father as Turbo man and my Mother as Mum.