Answer:
Janis= IAi, John= IAIB, Trish=IBIB, Stacie= IBIB or IBi, Harry= ii
Explanation:
All of these answers can be proved with a punnett square.
Janis has to have IAi because he has blood type A and we can see that Janis and John have a son Bob which is blood type A. However the reason as to why Janis is IAi and not IAIA is because Bob later on has a son (Howie) which has blood type O, Bob must be a carrier for the recessive allele i which can only come from Janis and not John.
John can only have IAIB since its blood type is AB.
Trish can only have IBIB since it has two childeren (Melanie and Len) which have bloodtype A and AB.
Stacie can have either IBIB or IBi----- proven by punnet square--- just a matter of probability
Harry can only have ii due to having blood type O.
