Quite a few families have more than one child. George and Mary Ritchie were lulled into a false sense of security with their firstborn, naively believing that their son was just the start of a peaceful, joyous life that could only be enhanced with another sibling.So, when a ginger-haired, podgy-pink kid with hiccups arrived on a bitterly cold December morning, they were beginning to think changes might be afoot. The new parents had no idea a child...