He was my maternal grandmother's father and he was born to William Lamb and Mary Ella Clark. William and Mary Ella are my brick walls on this branch of my family tree. If anyone has any clues, hints, or other pertinent information I would be very grateful!
What I know from word of mouth (and clues from old family photos) is that maybe by the age of 10, Ottis was living with an uncle (mother's brother) J.B. Clark. I think that his mother had passed or something? My grandmother is still alive (approaching her 86th birthday in four days) however she has suffered some strokes and can't really communicate anymore.