Burbin pointed out that Rey’s mother giving birth to a surrogate Palpy child (and assumably tons of other random women doing the same thing) is a little too strange for Star Wars, and I retroactively agree. It’s also extremely hard to convey in a concise way. That’s why I changed it to adoption - it’s nothing too out of place, and allows his reveal to Rey to build up in intensity over time smoothly. It also makes sense in general because Rey wouldn’t have any parents, making her a prime target for a couple looking for their own child since they can’t have one.