Last week (ends22Aug14), Cannon confirmed reports suggesting the couple had split, revealing he and Carey had been living apart for months.
But no one knew and even family members had no idea there was "trouble in paradise", as the comedian had put it.
The couple reunited to visit Cannon's grandfather, James Cannon, in Temecula, California, when they heard he had to go into hospital.
James tells Life & Style magazine, "Mariah, Nick and the twins (Moroccan and Monroe) were by here before I went into the hospital for three weeks.
"They were doing all right - there was no break-up then."