IIRC, Lisa Miller had the baby when she and Jenkins were together, as agreed between them.
So it would be more like, a woman and a sterile man in a relationship decide to that the woman should have a baby via artificial insemination, and then she leaves the relationship, without the man ever having established a formal legal relationship with the child.
There was a case in NJ where a man turned out not to be the biological father of a child he had thought was his, but decided to fight for custody anyway, and won.
What about the biological father in the NJ case?
Also, I have an adopted daughter. My husband and I jumped through hoops, filled out tons of paperwork, had to spend money paying fees and filing forms, we both had to do this to legally become my daughter’s parents. I couldn’t have just done it myself and said “oh yeah, your her dad”. It doesn’t work that way. If I had adopted on my own, it would have been a single parent adoption.