NPE has become the term for a person who has discovered one or both parents is not genetically related to them, popularized by the first wide-spread NPE support organization, NPE Friends Fellowship. Many people introduce themselves or describe themselves as “I am an NPE” — this serves to connect NPEs and can be a way to help non-NPEs understand how disruptive the late discovery of misattributed parentage can be to someone’s identity.

DNA surprise discoveries are not confined to one person in a family. When a DNA discovery upsets the truth, we see everyone involved hit with the ripples. Pain and anger, clarity and relief---all of these are common and normal reactions.

This website would be a great place to start if your main question is, "Which company should I choose to test with?"