Not enough information to answer. Consult a local custody attorney in person.
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That's not enough information on which to base a precise answer. Consult a local attorney and discuss the issue in detail.
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Based on the limited information you provided, you will have to file your application in Tennessee. Please also see https://www.ncjrs.gov/pdffiles1/ojjdp/189181.pdf which governs which state has jurisdiction for custody and support when parents live in different states.
I would be happy to follow up with you. Please email me directly or call my office if you would like to schedule an appointment either in person or by telephone. www.burnhamlawgroup.com Disclaimer: You cannot rely on the advice of an attorney given over the internet. The exact facts of your situation, including facts which you have not mentioned in your question, may completely change the result for your situation. Please be aware that the above comments are neither protected by attorney-client privilege, nor may be the basis for a malpractice lawsuit should the suggestion be followed with undesirable results.