After McPhee, 39, shared on Friday that she and Foster, 73, experienced a "horrible tragedy" in their family, sources tell PEOPLE that 2-year-old son Rennie David's nanny died suddenly.

David Foster celebrated his youngest with a party based on his son's latest obsession. “He wanted the Power Rangers,” Foster, 75, tells PEOPLE of son Rennie, 4, whom he shares with his wife ...

Katharine McPhee Celebrates Mother's Day with Sweet Throwback Photo of Son Rennie: 'Best Day of My Life' David Foster Jokes It's 'Upsetting' When Son Rennie, 3, 'Pounds' the Piano: 'He's a Kid!' ...

Jasmine Amy Rogers brings a bubbly humanity to the titular role, which has earned her critical raves, while Foster's jazzy ...

Foster and Katharine McPhee's 3-year-old son made his stage debut at the Kennedy Center in February. David Foster chats with ET's Deidre Behar at the 10th Breakthrough Prize Awards in Los Angeles.