Blood status is also called purity of blood . This is a concept in the wizarding world that distinguishes between family trees that have different levels of magically-endowed members. It often results in prejudice towards those who have a large number of Muggles in their families. As Sirius Black informed Harry Potter, almost all wizards of their time have Muggles in their family trees, though some claim not to. The concept played a key role in both the First and Second Wizarding Wars. Families that claim to be pure, to whatever extent they ever really were, are dwindling in number. Child born with magic to two Muggle parents is considered a Muggle-born and they are allowed in Hogwarts A school of Wizardry and Witchcraft. Those with prejudice against Muggles and their families often refer to such wizards as "Mud bloods," a highly offensive term implying that the individual has dirty and inferior blood. Those who discriminate against Muggle-born believe that they do...