“There’s no comparison at all when your son does that,” he said.
“It was my birthday last Friday, I was 60 last Friday, that’s why he handed me the thing and said ‘Happy birthday Dad’.”
The family had gathered at the back of the 18th green to watch as Lowry sealed his six-shot victory.
His father described the scenes as thousands of fans charged down the fairway to savour the moment as “mayhem” and “absolutely mental”.
“We all met behind the 18th,” said Mr Lowry.
“Padraig Harrington came in and he was like, ‘Would you all stop crying’. That’s what he said, everybody was crying.
“That’s what he dreamed about, like any young sportsman when they take it up they dream of things like that.
“What about winning the Open in Ireland – you can’t dream it, and in Portrush, which he likes too.”
As his son fulfilled his media duties, Mr Lowry’s mind was already turning to the celebrations.
“I’m going off to get a bottle of Heineken, that’s where I am going,” he said.