As the father of two young girls who have shown such poise, humor, and patience in the unconventional life into which they have been thrust, I mark this Father's Day—our first in the White House—with a deep sense of gratitude. I observe this Father's Day not just as a father grateful to be present in my daughters' lives but also as a son who grew up without a father in my own life. My father left my family when I was 2 years old, and I knew him mainly from the letters he wrote and the stories my family told....