Fifty years ago Ricky Nelson was tearing up the charts with rockers like "Waitin In School." The 17-year-old teen idol also co-starred with his dad, Ozzie Nelson, in a popular TV series. Seventeen years earlier, in 1940, Ricky was three months old when his dad (who was a popular bandleader in the 1930s) had his last chart hit.

Today, 15-year-old teen idol Miley Cyrus is rocking the charts with her biggest hit to date, "See You Again." She, too, co-stars with her dad, Billy Ray Cyrus, in the popular TV series Hannah Montana. Fifteen years ago and three months before Miley's birth, her dad (a popular Country singer in the 1990s) had his biggest chart hit.