Billy Joel's wife, Alexis Roderick Joel, has said his family is "hopeful for his recovery" after the singer-songwriter was diagnosed with a rare brain disorder.
Last week, the 76-year-old singer announced that he had cancelled all his upcoming performances and tour dates across the US and UK, after he was diagnosed with Normal Pressure Hydrocephalus, a condition caused by excess cerebrospinal fluid building up in the brain's ventricles.
In an Instagram post on Joel's official account showing the musician and his wife posing with their two daughters, Della Rose and Remy Anne, Alexis wrote: "Thank you for the outpouring of love and support.
"We are so grateful for the wonderful care and swift diagnosis we received. Bill is beloved by so many, and to us, he is a father and husband who is at the center of our world. We are hopeful for his recovery. We look forward to seeing you all in the future."
Joel's daughter, Alexa, recently described her dad as the "strongest and most resilient man".
She said: "We love you and we got you, Pop! I just wanted to thank you all for the beautiful outpouring of love and support amid the recent news of my father's health diagnosis.
"My dad is the strongest and most resilient man I’ve ever known … and he’s entirely committed to making a full recovery with ongoing physical-therapy treatments as he continues to regain his strength.
"The genuine care, empathy, and concern from everyone means so much to him … it means a lot to me, too."
Ms Joel, who is the daughter of Billy Joel and model Christie Brinkley, also quoted the lyrics to Joel's song Lullabye (Goodnight, My Angel), signing off with: "The music continues … "
The singer is best known for songs including Uptown Girl, Tell Her About It and An Innocent Man.
Since beginning his career in the mid-1960s, Joel has won five Grammy Awards and been nominated for 23 and was inducted into the Rock And Roll Hall Of Fame by one of his heroes, Ray Charles, in 1999.
