I remember a surgeon who does a lot of transplantation (and where they have to check DNA for compatibility), telling me that it also depends a lot on which chil

I remember a surgeon who does a lot of transplantation (and where they have to check DNA for compatibility), telling me that it also depends a lot on which child. The first child is almost always from the father. Second child a bit less. Third child is where there is a significant percentage of outside interference. To the point that they discourage same family donors as it creates a lot of drama.