What if one parent wants to sign, but the other parent does not?

Signing the Paternity Acknowledgment is voluntary for both parents and should be used only when there is ONE possible biological father. The acknowledgment is valid only after both parents have signed. Sometimes the mother asks to sign the acknowledgment and indicates that she will give the acknowledgment to the father for his signature. You may notarize the mother's signature. However, you may not process the acknowledgment until the biological father also signs.