Where did you see this? According to the rules of this forum, we need to have context (the entire sentence that contains the phrase) and source (where you saw this).
I found it in a book which is about to be published, therefore, I could not provide the source, I am sorry.
The sentence is like"If you come from a well to do background, you are surrounded by nice people...".
I put well to do in our Search box and this was one of the previous threads that appeared below the dictionary definitions. It's short but accurate. well to do