09/04/2014 AT 03:45 PM EDT
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, Caroline, while holding a package of plastic cups.
Caroline cried as she told Cepero how she recently found an old birthday card from her now-deceased grandfather that included that very message, nearly word for word.
Later, Cepero stroked Caroline's hand in a way the employee said was eerily reminiscent of her grandfather.
"It was almost like his spirit was in her body and he was trying to touch me and talk to me," Caroline told the cameras afterwards.
Angels Among Us
premieres Sunday (10 p.m. ET), after (what else?) Long Island Medium
With reporting by RENNIE DYBALL