TVC E. Canadian singer Michael Buble has revealed on social media that his 3-year-old son has cancer, and that he is putting his career on hold.

“We are devastated about the recent cancer diagnosis of our oldest son Noah who is currently undergoing treatment in the U.S.,” Buble and his actress wife wrote on his Facebook page.

They added that they’ve put their careers on hold in order to devote all their time and attention to helping Noah get well. Buble did not say what kind of cancer his son is suffering from, but said he hoped the family “will win this battle.”

Noah is the first child of the couple who married in 2011. Their second son was born in January. The 41-year-old has carved out an international career and won four Grammy awards.