They came out in therapy and therapist told us about them. After that two of them 'introduced' themselves to our hosty one of the time in a therapy session. The hosty one 'kind of' recognized them... as in her response was like "Oh, so that's why xyz - that was you!" She realized upon meeting them that she had known them all along, but 'without knowing', if you will.
Others we then met through our own internal process and inner work. I don't believe we have met all of them yet. We have some pretty big gaps to fill. Not gaps as in time gaps, but gaps as in areas of life that nobody owns, we don't know who takes care of it.