The royal tells PEOPLE his father "would have been a little more indulgent"

By Peter Mikelbank
Updated November 18, 2015 03:45 PM
PLS Pool/Getty; Inset: Staff/AFP/Getty

As Prince Albert‘s 11-month-old twins with wife Princess Charlene approach their first birthday on December 10, the royal dad is opening up about his late mother, Princess Grace.

“I think she would have been and outstanding grandmother,” he told PEOPLE in an exclusive new interview just before Monaco’s National Day on Thursday.

As for his father, the late Prince Rainier III, “He would have been a little more indulgent. More lenient than he was with myself and my sisters.”

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Those sisters, Princess Caroline and Princess Stephanie, are now proud aunts to Albert’s twins Prince Jacques and Princess Gabriella.

“Stephanie has come by more often than Caroline,” he reveals, “but that’s because Caroline is busy still, with her own daughter Alexandre. Stephanie came over yesterday to see the kids. Not to babysit, but if they want to volunteer for babysitting duty they’ll be most welcomed.”