To my initial post, I can empathize with someone who feels ambushed by someone knocking on the door claiming to be your long lost and unknown child. I suppose it could happen to me. It would change your world. I would want to know for sure of my parentage, but if mine, I want to do what's right. If they are money hunting, that might be different. Many if not most, just want connection and to know the truth, it's part of who they are.
I had a case where a 50 year old woman, my patient, was told by her mother (on her deathbed) that who she was always told was her dad, wasn't her biological father. Conception during a short affair happened, when she and husband were separated/expecting divorce and the mother never told anyone otherwise than her estranged husband was the father (and he was a deadbeat by her own words). Big time shock for her/everyone. She naturally had reservations about looking up her now elderly bio father, and with trepidation reached out, not wanting anything except to know him a bit. He had a family, grandkids, etc. She offered him a way out and was going to accept if he chose not to meet or know her, and explained that in a personal email. He called the next day with his wife and adult children on the line. She was accepted with open arms by everyone in the family, and is considered family now. It was an amazing journey/blessing for her and them. Many stories don't turn out this well, but there are some good people out there! It's been really healing for her, after her stepfather abandoned the family, and she always felt different than her siblings.
