I think a ouji board would be effective, but not without heavy purification and protection, and very specific correspondance with the desired outcome focused, I had a bad experience once, you don't want to invite any old spirit...
If you develop an inner temple, they will come and communicate with you there in meditation. As well a medium or psychic in a trance may be able to communicate for you. I have a book on this that gave me the idea.
Dream work is especially effective alot of people have told me their stories. Sometimes their energies are subtle and they just hang around watching over, but they are there often whether sensed or not. Family spirits are generally happy and do not need to bother with earthly life.
I would make a shrine like mexican day of the dead, with photos, aand candles and food as offering to the ancestors.
If I "dig" something specific up I will post it here for you haha