Speaking at the Los Angeles ceremony last Sunday, the 23-year-old singer – who scooped six Grammys – said: “I just want to say mum, your girl did good!’”
But she made no mention of father Mark who was overcome with emotion watching his daughter on television thousands of miles away at his Bridgend home.
“When she sings, it’s so beautiful,” he said. “But it brings back too many memories.
“It’s too painful.
“There’s so much regret on my part — regret that I wasn’t a better father to her.
“I let her down badly, and I wish I could turn the clock back and do things differently.”
Mark said he kept in touch with his daughter for years, spending summer holidays in a caravan in Tenby and days eating ice cream on the beach at Barry Island.
He remembered a happy-go-lucky little girl who loved swimming and was obsessed with the Spice Girls.
But Mark said alcoholism took over his life after his 57-year-old dad died from bowel cancer and all but destroyed his relationship with Adele.
“I hit the booze,” Mark told today's Daily Mail. “I got wrapped up in myself.
“I wasn’t there for her.
“The alcohol affected my relationship with Adele.
“I regret it and I always will.”
Adele told a US interviewer she has little time for her father and vowed never to speak to him again.
“If I ever see him, I will spit in his face,” she said in an interview with Vogue magazine this week.
“He will never hear from me again.”
Mark, who grew up in Penarth, said Adele’s words cut like a knife, adding: “I can’t believe she said that.
“I don’t know where it’s come from.”
Mark, now a recovering alcoholic, does not own a copy of either of Adele’s two award-winning albums, and has never seen her perform live.
Mark said he last spoke to Adele in December when he phoned to wish her a happy Christmas.
“I called to tell her I was thinking of her but it was a very brief call,” he said.
“She was very busy, but everything seemed okay between us.”
He met Adele’s mother, then an 18-year-old art student, in 1987 in a London pub.
After the birth of Adele Laurie Blue Adkins on May 5, 1988 her parents moved into a two-bedroom flat in Tottenham, North London.
Mark found work as a plumber, while Penny shelved her dreams of going to art college and concentrated on being a mum.
He insisted he was prepared to settle down and get married but Adele’s mum baulked at making such a commitment.
“I wanted our baby to have parents who were married,” said Mark.
“But Penny told me we were too young.
“She didn’t think I was ready to settle down.
“We gradually drifted apart.
“I loved her with all my heart, and vice versa, but it just didn’t seem to work.”
Mark remembered how Adele, then aged four, arrived in Wales carrying a toy guitar her mother had bought her in a charity shop.
He said: “She was teaching herself how to play it by listening to the old blues songs we used to listen to on my record player, then trying to make the same noise.
“She was quite good.
“Within a couple of years, she’d started singing along, too.”
Mark said Adele was “incredibly close” to her grandfather and devastated by his death in 1999.
“Losing my dad was the single worst thing that has ever happened to me,” he said.
“I loved him so much.
“He was everything to me.
“One of the hardest things for me is knowing he never saw Adele perform, never saw what she became.”
Mark said he had a complete breakdown after his father’s death, drinking two litres of vodka a day for three years.
“God only knows how I survived it but somehow I did,” he said.
“‘I hit the bottle so hard that I am pretty much oblivious to anything that happened to me in those three years, and I didn’t want Adele to see me like that.
“I was deeply ashamed of what I’d become.
“The kindest thing I could do for Adele was to make sure she never saw me in that state.”
Adele on the brink of stardom in 2007 sent her father and grandmother a copy of a song she’d recorded on CD, Hometown Glory.
Mark said: “We listened to it and I remember looking at my mum and thinking ‘Where did that voice come from?’
“But I believe Adele was born to sing.
“It’s in our blood.
“I was a choirboy and my mum still sings in Penarth Baptist Choir, so perhaps she gets it from her.”
The last time he saw Adele was last summer, when she went to Penarth to stay with her grandmother, Rose.
“We drank tea together,” said Mark.
“She didn’t talk about her career much, she just said life was going well and she was happy.
“I’m so proud of her — I’m walking 10ft tall at the moment.”
He said he would like to congratulate his daughter on her Grammy success but said he’ll wait for her to contact him.
“What’s done is done,” he said.
“I can’t turn the clock back.
“I know I was a rotten father, but, in the end, she’s made it.
“She deserves all the happiness and success in the world.”