Your post is hard to understand.
How are Kierstyn and Ava related to Melissa?
Who are "we" that pay for living expenses and "pay for them while in school"? Whose living expenses do they pay for?
What is "this" that you need for tax purposes, and what are the "tax purposes" that you need "this" for?
What do you need help with?
Are you saying that Kierstyn and Ava can be claimed as dependents, but they filed tax returns without checking the box that says they can be claimed as dependents? If that's what happened, they have to file amended returns indicating that they can be claimed as dependents. They should not file the amended returns until their original tax returns have been processed by the IRS and they have received their refunds (if any). Then it could take as long as 4 months for the IRS to process the amended returns.
BUT, are you concerned that whoever is claiming Kierstyn and Ava as dependents is unable to e-file because they did not indicate that they can be claimed as dependents? The amended returns will not allow the person who is claiming them to e-file. Whoever is claiming Kierstyn and Ava as dependents will have to file by mail, even after Kierstyn and Ava file amended returns.
