You can claim your parents even if they are filing as MFJ as long as they are filing their return to get a refund for taxes withheld (Filing just to get a refund of tax withheld means you are not receiving what's called a refundable credit. A refundable credit is a credit that allows you to get back more tax than you paid in during the year. Some example of the most common refundable credits is the Earned Income Credit).
Also to be able to claim them you need to answer NO to the question If your parents filed MFS return, would either of them have any taxable Income?
You need to amend their return and make sure your are answering the questions correctly and you need to file your return by mail. IRS takes weeks to process amended return.
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