I'm not certain about the information provided, because my line of Great-Grandparents on my Mothers side come directly from Royalty and my daughter and I both have A+ Blood type, as well as several other family members. I'm also not certain how accurate this information would be with blood types, as this technology did not really exist until the 1900's. When you go all the way back to the 1600s and further, there were so many families that married cousins (including first cousins), to try and keep the blood lines pure.