Forget the crystal ball and tarot cards. All Rosie Cepero needs to communicate with someone's guardian angel is a message from beyond - even if it comes to her while shopping at a party store. In an exclusive first look at Angels Among Us - a new TLC series premiering Sunday and focusing on Cepero's special ability to communicate with angels - the upstate New York wife and mother moves an employee to tears as she relays a message from the young staffer's beloved grandfather. "He says, 'It's okay, you can indulge in ice cream,' " Cepero tells the employee,...