"a song from your childhood"

This was my lullaby song by Dad. He used to sing this to all of us before sleep and I had always thought that this was actually a lullaby song like Indonesian "nina bobo". I just knew that this is actually a Christmas song years later. When I asked my sister about the same question above, she answered straightly the same song title: The Little Drummer Boy. While browsing for the video I found this short movie about the song: