Hello, I'm so confused with this blood typing question! Please help!

Question

anonymous · Answer

Could Child 1 have been born to Mr. and Mrs. James? How about Child 2? 

Mr. James - type AB
Mrs. James - type A
Child 1 - type B
Child 2 - type O

I said that both children could have been born to Mr. and Mrs. Smith because Child 1 is type B, and Mr. Smith is type AB. Additionally, Child 2 is type O and Mrs. Smith is type A and probably heterozygous (AO) and that is why she passed on an O allele to the Child .But when I confirmed it with possible Punnett square:

Mr. James is type AB, Mrs. james is type A, heterozygous:

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