How people handle this situation is different. I ran across a similar situation in my line. Something very few of the family know, and those that do try to ognore. My great grandfather John was born to a Jane and Charles -per family history. John used Charles last name as did Jane. The only problem was that Charles died 1865 (married to Jane and had a few children by her) and John was born 1873. What had happened was the after C hrarles died Jane lived with a "respected" family as a housemaid/ One of the children there fathered John, but whether this was consensual or otherwise I have no clue. I have an idea, but with no facts, where do I go?

What I did in my file was list Jane with first husband Charles and listed the children to them. I indicated in notes his death and family history, showing the family name heritage. Under Jane's seconfd husband (although never married) I listed the person's name (my father has information that leads to high probability of correctness) and John as son of Jane and him. I also made notes under his name (or Janes's, not sure which at present) to indicate his genetic fatherhood heritage.

I've not heard from others who have extensive genealogy records in the family, quite possibly thev've not seen what I did.

Due to genetic diseases, strains of DNA patterned illnesses etc, I think it best to include all information, but be
very discreet in how it is done.

After including the second "husband", and his extensive genealogy, I discovered we were related via an entirely line anyway!