In 2013, Mark revealed he was battle bowel cancer and feared he would never meet his grandson, 8-year-old Angelo, whom Adele has with her ex-husband Simon Konecki.
However, the singer's father claimed in 2015 that her album, '25', had proved to be a cathartic period in their relationship and that they had patched up their dispute.
Mark even called the feud a "misunderstanding", but those claims were countered by Adele in a speech at the 2017 Grammy Awards, in which she told her manager that she loved him "like I would love my dad".
She said: "Thank you to my manager because the comeback, as it were, was completely masterminded by him.
"And you executed it incredibly, and I owe you everything.
"We've been together for ten years, and I love you like you're my dad. I love you so, so much.
"I don't love my dad, that's the thing. That doesn't mean a lot. I love you like I would love my dad."
The 'Rolling in the Deep' singer – who divorced Konecki in 2019 – also failed to mention her father when she picked up the Album of the Year award at the same ceremony.
She added: "Grammys, I appreciate it, the Academy, I love you, my manager, my husband and my son - you're the only reason I do it."