If they filed a joint return, did they e-file? What income did they include? Do they have pensions? Investment income? Did they itemize their return? You cannot e-file a $0 return so it seems like they would have had some sort of income unless they paper filed.
In order for them to file a joint return and you to claim them, they would only be able to file in order to claim a refund of taxes withheld. So without knowing how or why they filed and what they included on their return, it is hard to say if you can claim them with their tax situation.
If you do qualify to claim them as dependents, then you will need to print and mail your return and they would likely need to amend their return to say they can be claimed as dependents. Depending on why they filed, if they have no income and you provide all of their support, they may need to amend to Married Filing Separately in order for you to claim them.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
