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I am afraid that if the mortgage was in both of your names, you are going to have to have her sign the check to cash the check. Whether or not she is entitled to any share of the check depends on the court order dividing assets. If she was not given any share of the house and it was given to you, or she was already paid in some other type of marital assets for signing the quit claim, then she would not be entitled to any share of the check, but because her name appears on it, her signature would still be required for you to either cash or deposit the check.
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