Wow, that's a huge question for me. I have faced the fantasy dead on with respect to my own mother and my own mothering.
What happens, I think is that we face the reality -- and let go of the fantasies we have lived with, for years. On some level, I hope we begin to accept, the human side.
And, on another level, we understand the crying child within ourselves, who was neglected, abused.
OH, my....a LOT happens when we let go of the dream.