If you believe that you have fathered a child, but are not listed as a parent on the birth certificate because the child was born out of wedlock or was born unbeknownst to you, you can establish your rights as a father by filing for paternity.
According to the Arizona Department of Economic Security, paternity means the condition of being a father. If you are able to establish paternity, you will be able to enforce your parental rights. This includes custody of the child, visitation rights, rights to include the child in your will, rights to support the child financially and more. This can also be a benefit for the mother of the child, who may be interested in seeking child support from you.