I overstayed on my visa a couple of months back, the fine was 120tl. Usually they only ban you if you overstay by more than ten days on a tourist visa and try to leave the country (rather thansorting it out at a police station before going to the airport.) I think if your relations pay the fine the ban will then be reduced to a three month one,theoretically you are allowed to pay the fine when you next come to turkey, perhaps the excessively long ban is an incentive to get them to pay sooner? Incidentally if you have a residence permit all the fines have recently been vastly reduced.