When Mario’s Restaurant — a 101-year-old Arthur Avenue institution — reopened for outdoor dining at the end of June, it was a bittersweet return to the family business for Regina Migliucci-Delfino. She lost her father, Joseph Migliucci, 81, the longtime face of the Bronx restaurant, to COVID-19 in April.

The night before the elder Migliucci died, he asked his daughter to promise that she would do everything she could to make sure that Mario’s would reopen. “He said, ‘Now you’re the boss, and you need to run the show,’ ” Migliucci-Delfino, 58, told The Post.