Thanks for the info everyone.
Turns out at this time I cannot donate to my dad. I am a 50% match, but there is something else they look for to be a mismatch and unfortunately I am a match to my dad. Does anyone know exactly what that is? I know I didnt give too much info, but as the nurse was telling me on the phone it all happened so fast I didnt ask her any questions.
Maybe a certain gene or something? I turned out to be a match in whatever they were looking for, now I'm worried I might get it or my kids will be diagnosed with a blood disorder down the line.
Any info will help.