So...I think all families have - by definition - a certain nebulous aspect: the outer limits are vague, and there are always mysterious step-aunts and proto-cousins a couple counties away, or in nominally familiar-sounding cities (Joliet? Las Cruces? Macon? Muncie?) in states unseen. They may or may not pop up at the occasional family reunion, or as some unannounced Thanksgiving surprise shrouded in sighs, whispers and the sort of ethereal intrigues delicately deflected from the ears of the...