Joe Biden recently opened up about the final moments of his son, Beau, who died of brain cancer in 2015.

During a recent conversation with Oprah Winfrey about his book, “Promise Me, Dad: A Year of Hope, Hardship, and Purpose,” the former vice president revealed that he was holding his son’s hand before just minutes before he passed away.

“Beau looked at me and he said, ‘Dad, I’m not afraid. I’m okay.’ It was at the very end. His brother, Hunter, was sitting there, the three of us were holding hands and Beau wanted to reassure us that he was okay,” he said (via People).

Biden also said that that moment wasn’t the only time his 46-year-old son reassured him that things will be okay. There were also times when he would visit him at the hospital and Beau would tell him to not look so sad. “He’d say, ‘Dad, look at me. Stop looking sad… no matter what happens, I’m gonna be alright, Dad. You’ve got to look happy. You’ve got to look strong for the family,’” he shared.

And even though Beau is not with him physically anymore, he sees him through his grandson. “What I do is I look at my grandson – his son – and I see him. I look at my granddaughter, I see her. And I know Beau’s still here. He’s still with me,” he said.

Last week, Biden also appeared on the “Ellen Show” to promote his book. While speaking with host Ellen DeGeneres, Biden said that he wrote the book so that more people would get to know his son, Beau. He also shared the story behind the book’s title, “Promise Me, Dad...,” which came from his son.

When Beau was still alive, he would always ask his dad to promise him that he would be alright even after he’s gone. And Biden said that it’s what he’s been trying to do no matter how difficult it is.