I would to share a story that my family was told about this song when I was young. I am now 75 years old.
To start off, my maternal grandfather was a local poet in his hometown. He used to write poems. He passed away in 1958. According to the, as told by his cousin in law, the lyrics was
written by my grandfather. The paper was taken from my grandfather & was made into a song. My grandfather was never given a credit for writing it.
I am not sure if this is accurate and I not trying to take credit for it. I just want to share what the family knew for so long about this song.
Nonetheless, it is a beautiful song with beautiful lyrics dedicated to mothers.