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(a) By mutual consent, the parents of a child may modify an agreement regarding custodial responsibility made pursuant to this Article.
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(b) If an agreement is modified under subsection (a) before deployment of a deploying parent, the modification must be in writing and signed by both parents and any nonparent who will exercise custodial responsibility under the modified agreement.
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(c) If an agreement is modified under subsection (a) during deployment of a deploying parent, the modification must be agreed to in a record by both parents and any nonparent who will exercise custodial responsibility under the modified agreement.