The commercials air every holiday season. They’ve featured an adorable little boy trying to make a lunch date with Jennifer Aniston , a giggling mischievous cherub teasing Robin Williams , and another hanging out with Olympic champion snowboarder Shaun White. These kids are cancer patients and their celebrity pals implore viewers to make donations to St. Jude’s Hospital. Every year I’d come across them while channel surfing and think, “Thank God, we’re not one of those families. Thank God we don’t have to deal with that!” That was until we were. Our 11-year-old daughter had been complaining...