Download or Printout a copy of SI 5 HERE! and get the declaration sworn in by yourself and your child's mother by a peace commisioner or a commisioner for Oaths.Your local Garda station should be able to give you the name and address of a Peace Commissioner in your area
On section 4, page 2 of the form make sure to strike out the word "access", otherwise you will be conceeding some legal rights!
NOTE:Make two copies of the signed Statutory Declaration, one for the mother and one for the father. Keep the document in a SAFE place as there is no register or record of this document kept by any official office. If you lose it then there will be no record of your being a Guardian.If there is more than one child a separate Statutory Declaration is needed for each child.