The Macchio family - Ralph, mum Phyllis and younger brother Daniel - is close and they've seen Julia in Flashdance "a bunch of times" since she debuted in the role as steelworker and club dancer in October.
Like most proud dads today, Ralph, 54, posted on his Facebook page after her first performance: "Please go see Flashdance National Tour starring Julia Macchio (proud papa) coming to a city/town near you! It's fantastic. You will love it!!"
Friends and fans responded, saying Julia was "amazing" and that the elder Macchio has a "very talented daughter" who "stole the show".
Julia doesn't mind interviewers asking about her dad because she is delighted by the example he has set.
"If I'd made a movie that people were still talking about and remembering so positively 30 years later, I'd feel very proud."
Throughout her childhood, Ralph was often stopped by fans who requested he do the most famous Karate Kid move: the crane-kick. Julia says he was always polite to fans and ocasionally he obliged with a re-enactment of the iconic step.
Flashdance - the Musical was written by film screenplay writer Tom Hedley and debuted in 2008, 25 years after the movie came out.
A two-year UK tour followed, before it touched down in the US, where it has completed three tours.
The New Zealand performances at The Civic in Auckland are its final ones.