You could print and mail your return with Form W-7 attached to apply for an ITIN for your mother-in-law. You can get an ITIN for her if she does not live in the US. Here's more info on Claiming a Non-Resident Dependent.
To prepare your return in TurboTax, you can use a 'fake' SSN (like all 9's) and white it out on your printed return, and write 'W-7 Attached'.
A Qualifying Relative Dependent is a $500 deduction on your tax return.
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