The grant deed to our rental property is in my deceased mother's and my wife's name. We want to transfer the property into our names, my wife and I.
If your wife and her mother were joint tenants, then filing a notice of death of joint tentant followed by a grant deed from your wife to the two of you is the process. If your wife and her mother were tenants in common, you may have to have a probate to transfer title to your wife (if she is the only heir) then on to the two of you.
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I agree with Mr. Doland.
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