Get your taxes done using TurboTax

I have 2 extensions to file. Our disabled son has a small refund due but due to injury I can't get both ours or his taxes filed.  I already applied for an extension for his, but now it won't allow me to apply for an extension for my wife's earnings, as it keeps popping up that "Looks like you already applied for an extension" statement repeatedly.  I'm at my wits end trying to get this filed!!!  The tax files for both his & my wife's & my files are totally different returns so how in the heck do I get this electronically filed buy midnight??????