So, when you're trying to find out stories about your family and are questioning relatives, don't be surprised if sometimes they are not forthcoming. They may think their lives are boring or they don't recall the past clearly. Also they may be afraid they may be drawn into sensitive topics that they would rather leave well alone. Show you are sincerely interested, go gently and don't be judgemental.
And remember, sometimes a stranger can have more luck in the interview process.