David Foster and Katharine McPhee Open Up About Death of Their Son’s Nanny: ‘It’s Been Tough’

David Foster and Katharine McPhee are still grieving the loss of their 2-year-old son Rennie’s nanny, Yadira Calito.

“It’s been tough for [Katharine],” Foster, 73, told Entertainment Tonight in a joint interview with McPhee, 39, on Thursday, September 14. “Yeah, it’s been tough. She’s managing.”

In August, McPhee announced that she would be missing the final two shows of her and Foster’s Asia tour due to a “horrible tragedy” in their family and she…