In case of disputed parentage when blood groups of parents and children are known it can be easily decided whether a given child is born to particular parents or not. When the parent’s blood groups are known, their genotype can be worked out and the child’s genotype and blood group can be matched.
The following table gives (in cases of disputed parentage) the blood group of mother, child and the unlikely blood group of father i.e., if the blood group of mother and child is of a particular type, the disputed father cannot have the genotype given in the table in that he is not the father. It should be noted however that in instances when both the babies and families are of the same group it will not be possible to decide (if the disputed father also has the matching blood group) parentage on the basis of blood group.