Sharon Osbourne has broken down in tears on US television as she tried to speak about her son's recent multiple sclerosis diagnosis.
Addressing fellow panel members on her show The Talk, she thanked both friends and fans for the support they have shown the family.
Jack, 26, who recently become a father, was found to have the incurable autoimmune disease after a frightening spell in which he lost 60% of the vision in his right eye.
His condition was revealed in an interview with Hello! magazine in which Jack said he had experienced a range of emotions.
He has spoken out to raise awareness of the condition and the support of his fiancee Lisa Stelly - who gave birth to baby Pearl two months ago - is helping him to keep a positive outlook.
He said: "The timing was so bad. I'd just had a baby, work was going great - I kept thinking, 'Why now?"'
X Factor judge Sharon said she has been questioning whether she is to blame. "I keep thinking, 'what did I do wrong? What did I eat or drink when I was pregnant?' I feel like it's somehow my fault."