Big Daughter or a Test for...

He is 37, she is 17. He is still young and handsome, flirts with her classmates, causing violent indignation in his daughter. She brings her fans into the house, who drive her father into a rage. And yet, father and daughter love and understand each other. But an unexpected character appears in the life of their small family. What should a father do when his daughter is in love with his business partner?