May 28, 2015 11:11 AM EDT

The father of Tamir Rice, the 12-year-old Cleveland boy fatally shot by police last year, said he’s struggling to tell his other children why their brother is no longer alive.

In his first public interview since Tamir’s death, Leonard Warner told NBC affiliate WKYC on Wednesday that he has no answer for the boy’s siblings.

“Every time they wake up, they asking about him … and they go to sleep, they asking about him,” said Warner, adding that he doesn’t give the kids details about how Tamir died.

“I can’t tell them, but he’s watching over you,” Warner said.

A Cuyahoga…

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