The code in all families when things are down or go bad is that "Blood is Thicker Than Water". It is not always the case for everyone. Depending on the family and the relationships created within, some may want a transfusion for better blood that is thick enough to help them out.
To each its own in how thick the blood is and should not be guilted in believing it is should be followed verbatim. Not all blood is good due that some can be tainted and cause more damage than good.