Former President Joe Biden’s son, Hunter, is giving an update on his father’s battle with prostate cancer saying it has spread beyond his bones.

During an interview with the BBC, Hunter said it’s been “really sad to watch”, describing the cancer as painful and debilitating.

Joe Biden was diagnosed with an aggressive form of prostate cancer in May of last year. But, despite his health challenges, Hunter says his 83-year-old father remains active and is also preparing to release a memoir later this year.