It depends on your custody arrangements. Worst case scenario you can have him sign off while in custody.
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I disagree. Both parents must provide parental consent regardless of custody arrangements. There is a lot of paperwork for you to provide, and it's too involved to list. Check the web site. Link below.
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I would suggest that you contact the local sheriff's department closest to the jail where the father is incarcerated. You can pay the sheriff to take the father the forms you need signed and have the sheriff mail the forms back to you. That would be the easiest and safest way to get the signature you need.,