We cannot insist that someone else take responsibility for their actions; only they can make that choice when they are ready.
Perhaps the problem lies with the activity of blaming. Whether we blame others or blame ourselves, there is something aggressive and unkind about it. It sets up a situation in which it becomes difficult to move forward under the burdensome feelings of shame and guilt that arise. It also puts the resolution of our pain in the hands of someone other than us. Ultimately, we cannot insist that someone else take responsibility for their actions; only they can make that choice when they are ready. In the meantime, if we want to move forward with our lives instead of waiting around for something that may or may not happen, we begin to see the wisdom of taking the situation into our own hands.
We do this by forgiving our parents, even if they have not asked for our forgiveness, so that we can be free. We end the abusive relationship with our partner, who may never admit to any wrongdoing, because we are willing to take responsibility for how we are treated. In short, we love ourselves as we want to be loved and create the life we know we deserve. We leave the resolution of the wrongs committed against us in the hands of the universe, releasing ourselves to live a life free of blame.