I agree that the background is a problem. On my laptop screen I can see not only the draping (which could be okay) but a horizontal crease (not so okay) right in the center. I hear something about putting the subjects further away from the backdrop so the backdrop doesn't pick up the flash light and stays nice and dark, but I don't know much yet so you might want to look into that. The fix that PP "autofocus" did looks much better than what you started with so that's a possible solution for you Cute family!
Canon Powershot SX50 and learning quickly!