If a child does not have either one of his parents blood type is he there child?

It is possible for a child not to have either of his parents' blood types. This can happen if the child inherits a rare blood type from a grandparent or other ancestor. For example, if a mother has type A blood and a father has type B blood, their child could have type AB blood, which is a combination of both A and B. Alternatively, the child could have type O blood, which is the absence of both A and B. This happens when both parents are heterozygous for their blood types (i.e., they each carry one A allele and one O allele). In this case, there is a 25% chance that their child will have type O blood.

Therefore, it is not necessarily true that a child who does not have either of his parents' blood types is not their child. However, it is worth noting that a discrepancy in blood types can be a sign of a potential paternity issue and may warrant further investigation.