"Caleb's death has raised many questions about how and why this could happen to a seemingly healthy boy," the Bratayley family Instagrammed on Monday. "Sadly, tests have confirmed today that Caleb passed away from an undetected medical condition."
Caleb's parents added that they expect to "have more definitive answers in the coming weeks."
"[We] ask that you help us celebrate his life instead of focus on his death," the Instagram caption continued. The family has also decided to livestream Caleb's ceremony on Wednesday at 8 p.m. EDT. due to the "outpouring of support and people's hope to be part of his memorial."
The family also posted a video in remembrance of the YouTube star, who did an online show affiliated with Disney’s Maker Studios with his two younger sisters, Annie and Hayley.
"Words cannot describe how much we will miss him," the video description reads. "His incredibly funny, loving and wonderful spirit made us all fall in love with him as a YouTuber, friend, brother and son."