DrAdams:
I would suggest contacting the school(s) that want the DO letter of recommendation and ask for clarification. I personally would think that a LOR from a family friend who knows you well would be a better representation than someone you have shadowed once or twice. Perhaps you could shadow your family friend to cover all the bases.
When I did my LOR, I asked a friend of mine if I could shadow him a couple of times. His LOR was more as a "character reference" than about my experiences shadowing him.
Wook