Mumbai, Sep 23 (SocialNews.XYZ) Actor Jason Isaacs, who played Lucius Malfoy in the “Harry Potter” franchise, penned a heartfelt birthday note for his on-screen “son” Tom Felton, who portrayed Draco Malfoy. Isaacs took to Instagram, where he shared a then-and-now picture with Felton. He urged the audience of “Harry Potter and the Cursed Child” in New York to sing “Happy Birthday” for him during the curtain call. “I had your ear back then and you know you’ll always have mine. Happiest of birthdays, son. You’ve given so many people so much pleasure this year in New York but what they don’t know is how important that is to you.