This is what I would do:
- Print out the Allocation Situation 4 from the Instructions, and highlight the sections where it says (a) if they agree, it can be allocated in any way and (b) all three percentages must be the same.
- Print the copy of the father's 8962 showing the stupid CPA firm did not do all three percentages the same.
- Calculate the credit on BOTH returns, showing the results if it is allocated 0/0/0 and 100/100/100.
- Calculate the credit on BOTH returns, showing the results if it allocated 75/75/75 and 25/25/25.
- IF they are willing, have BOTH the father and daughter sign a statement that they agree to 0/0/0 and 100/100/100. If they don't sign that, your only option is to claim 25/25/25 on the daughters return.
- Give your business card to the father, as he may be leaving his CPA when he realizes his CPA doesn't know what he is talking about and/or he receives an IRS notice because he tried to claim 0/0/75.