The characters I am bringing to the table are:
Sarah, a 37 year old blonde accountant and soccer mom. Tall, highly intelligent, pragmatic and confident.
Karen, a 19 year college student and daughter of Sarah. Nerdy, also a blonde. A little shy.
Elizabeth, Karen's 17 year old younger sibling. She is redheaded, a little more tomboyish, athletic (swim team) and something of a rebel, though not hardcore about it.
This is just a starting sketch, of course. They will live at 342 Robin Lane, a three-bedroom house in a middle-class neighborhood near the railroad tracks...on the other side of which is a seedier part of town.