Amy Schumer's humour keeps her family "tied together".
The 34-year-old comic's father was diagnosed with multiple sclerosis (MS) when she was 12 years old and she did her best to keep "everybody laughing" and "take care" of all her loved ones.
She recalled: "He was in physical pain. That's when I kind of took the lead and took care of everybody in my family.
"I would keep them -- I would keep everybody laughing. I'm the one who ties it all together."
And the 'Trainwreck' star admitted it can be hard to see her father when he is in pain with the degenerative disease.
Speaking during an interview for Barbara Walters' upcoming '10 Most Fascinating People' special, she said: "He's not good. Some days he's really good and he's with it and we're joking around. And some days I go to visit my dad, and it's so painful. I can't believe it."
Amy has previously spoken of how her dad's disease inspired scenes in her movie 'Trainwreck', in which her on-screen father, who was played by Colin Quinn, has MS.
She has said: "There is no denying that there is a lot of me in this movie. I, as they say, went there. It's really personal.
"It's about stuff I was struggling with and am constantly battling."