My daughter Sarah graduates tonight. The math doesn’t add up. It wasn’t that long ago we brought her home from the maternity ward, a dark-haired, swarthy-skinned, wide-eyed little thing, half polecat and half princess. She was already spoiling for adventure and hunting mischief. And it was quite recently she was a feisty tyke, all of four, ready to take on a whole gang of nine-year-olds in the park behind our yard because they’d snatched her brother’s toy. There must have bee