The Dreamwidth Journal of zdashamber

You know, I have that problem with my family too. With both my parents having been married 4 times each, and had at least a few kids on the way, my family tree is more of a hedgerow. The one that always confounds me is my dad's ex-wife with whom my dad had a child (my half-brother) and then she remairried and had another child (my half-brother's half-sister). There's no relation there, and I've never thought of Wife #3 as being my mom. I generally refer to her as my "step-mom." Even though my dad has since remarried. I have no idea how to refer to my brother's sister. "Step-sister" seems the easiest, but not exactly accurage. Quarter-sister? Nickle-sister? Shirttail sister?