Should Jeanette for give her parents?

I think she absolutely forgave them...... and yes, she should have. Too much baggage comes with anger. Forgiveness enables people to be free of the past (usually).

In the final scene of the memoir, Jeannette intentionally resurrects the memory of her father. Instead of remembering the hardships he caused the family with his alcohol and gambling addictions they instead recognize the very thing that made Rex Walls unique; his propensity for finding excitement. This scene is indicative of a larger theme in the memoir of not judging Rose Mary or Rex or criticizing them harshly. Instead, Jeannette offers her story to the reader without condemning her parents or complaining about her upbringing. Perhaps, in writing the "truth" instead of hiding from it, Jeannette is set free by it--free from shame, from the need to lie about her past, and free from any feelings of contempt that may have existed for her parents.