https://www.verywellhealth.com/graft-vs-host-disease-overview-5077111?utm_campaign=15823081179-bc16abb1234b67&utm_source=googleawpaid&utm_medium=con&utm_content=573641057935&utm_term=g-graft%20vs%20host&gclid=CjwKCAiAp7GcBhA0EiwA9U0mtvDUk_2Wu6_BCRElC6OM7F96ZJ1uSY2kWuLOfl4ZNcfEUAtgMXdqSRoCtdoQAvD_BwE.

I just found this on " graft vs host disease"... please explain in terms of your comment that "there is a higher risk from related vs unrelated".... I would think the parents should be able to match better than a foreigner.

Doctors try to avoid GvHD by genetically "matching" donors to recipients, often by recruiting a sibling or other family member with a similar genetic makeup.