Not so long ago, the prospect of George Clooney being a besotted husband — much less a dad to newborn twins — seemed fairly unlikely.
But one person who always knew the one-time world’s most eligible bachelor, 56, had it in him? His father, Nick Clooney.
“I’ve been telling George since he was 30 that I thought he would be a great parent,” the elder Clooney tells PEOPLE.
Whenever George mentioned how he didn’t see kids in his future, Nick recalls, “I would listen to him patiently and then finally step in and say, ‘George, some astounding woman is going to knock your socks off, end of story.’ And it’s exactly what happened.”
Want all the latest pregnancy and birth announcements, plus celebrity mom blogs? Click here to get those and more in the PEOPLE Babies newsletter.
RELATED VIDEO: George and Amal Clooney Welcome Twins!
Indeed, just seven months after George and now-wife Amal met in 2013 through mutual friends, they got engaged. The couple were married in Venice, Italy, over a four-day wedding celebration in September 2014.
“You just look at them and you feel like they’ve been a mother and father for their whole lives,” she adds.
FROM PEN: How Alicia Silverstone Maintains a Strict Vegan Diet For Her Son Without Judging Other Moms
Nick, too, is heartened by how George has embraced fatherhood and appreciates what a big step it is.
“This change is more profound than any change in his life,” says Nick, “and he is excited.”
For more on George and Amal Clooney and their new life with the twins, pick up the latest issue of PEOPLE, on newsstands Friday.