Happy Father's Day, Mr. President. 🇺🇸 First lady Dr. Jill Biden took to social media Sunday to pay tribute to her family on the holiday. She also reminisced about her own father, the late Donald Jacobs, a naval signalman in World War II whom Biden dubbed "my first hero." "If I close my eyes, I can still hear his encouraging voice saying, 'Good for you, Jilly-bean!'" she wrote. "I miss him every day, especially on Father’s Day. My heart is with those who are also missing their dads today." 👉 Swipe through for throwback pics of the president and his kids #FathersDay. 📸: @apnews; @gettyimages