Millions of people do not know who their parent (or parents) were. That is one of the reasons why taking DNA tests has become so popular: trying to find “matches” with previously unknown relatives, especially parents.
An article by Michael Segalov published in The Guardian describes several stories relating to just such searches: Now adult children discovering (for the first time) their father,
Typical responses include:
“Dad needed me as much as I needed him. Being his only child, meanwhile, worked out perfectly for me; after 35 years apart, selfishly, I didn’t want to share him.
“We live together now. He’s more than just a father, he’s a best friend. In a matter of months he went from total stranger to being one of the most important people in my life; the same for my children.”
Another response:
“I didn’t intend to find my father, but my roots. Opening the results was one the most shocking moments of my life – apparently I’m exactly half Afghan. Lower down the page was a long list of cousins.”
If you want to read some heart-warming stories, read “‘I took a DNA test and found a new family’: the drama and joy of meeting long-lost relatives” by Michael Segalov at https://www.theguardian.com/global/2021/nov/21/i-took-a-dna-test-and-found-a-whole-new-family.