I tend to use my web design/tech background and let my (elder, for the purposes of this example) sister know that she was in fact the Alpha release, and i am the Beta - not perfect, but definitely ironed out most of the flaws from the first attempt.
I have used Bellcheese a few times, largely off the back of a certain popular thread. See also: Wankpuffin
I have also jokingly refer to my sister as a trollop. She usually fires back with something equally untrue, like i'm not loved, or adopted....