What will be the chald blood group if the father is ab positive and the mother is o positive?

If the father has an AB positive blood type and the mother has an O positive blood type, the possible blood groups for their child could be A or B. The A allele from the father can combine with the O allele from the mother to produce an A blood type, while the B allele from the father can combine with the O allele to produce a B blood type. The child cannot have an AB or O blood type in this scenario.