Blood group is a classification of blood based on the presence or absence of certain antigens. It is determined by the combination of inherited genes from both parents. The most common blood group system is the ABO system, which has four main types: A, B, AB, and O. KIN is an abbreviation for kinship, which is the relationship between two people who are related by blood or marriage. CLAN is a group of people who share a common ancestor. TYPEAB is a type of blood group that is a combination of both A and B antigens. REDCROSS is an international humanitarian organization that provides emergency assistance, disaster relief, and education in times of crisis. RHFACTOR is a protein found in the red blood cells of some people that can cause a reaction when it comes into contact with certain other proteins.