Tom Riddle is raised in an orphanage, and Dean Thomas has a (step?)father as per DH, as, probably, does Blaise Zabini (as per HBP where his mother is cited as marrying a lot in general).
Needless to say, I find this extremely o.O-inducing.
I've left out everyone about whose family situation we know nothing, but here is a listing of HP characters and their parental arrangements. I've cited chapters here and there, but I'm going mostly by memory and so most of the time, I've cited just books.
( can has data?Collapse )
So out of 44 families whose situation is known, 33 (a full 75 per cent) are clearly traditional two-parent families. For 7, status is impossible to determine, 2 are widower!single parents and only 2 are "other parent left" type single parents. That's four per cent.
In other words, the only explicit instances of single parents who isn't widowed are those of Merope Gaunt (whose child is born evil) and Hagrid's father, whose 'wife' was not even human.
JKR? I o.O at you. I o.O at you hard.