Oral history is more than just asking questions. Often the person who has the story will hold back. I learned that the hard way. When ever I asked my mother for a story she danced around the bush rather that tell it to me.
One time when my mother opened a telephone conversation by telling me "I have a story to tell you." I not only listened I picked up a pencil and wrote it down. Later, by doing some sleuthing, I added another level of details to flesh out her story. In this video I tell the story I made from both elements.