Idk if this makes sense.
Obviously not via sexual reproduction but could a person’s genetic parents be of the same sex and that person be genetically indistinguishable from the rest of the population?
It’s likely possible, but not at this stage of humanity. The human genome was only unlocked in the past few decades.
Gotta remember, the body of science of any field is still itself growing. More information becomes clear all the time. What was once considered impossible is now everyday boring stuff.
There are limitations to what we can do, and what we know we can do. It isn’t until we test more and try different things and unlock new technologies that the impossible becomes possible.