The father of a child is the man
1. who is married to the mother of the child at the date of the birth,
2. who has acknowledged paternity or
3. whose paternity has been judicially established under section 1600d or section 182 (1) of the Act on the Procedure in Family Matters and in Matters of Non-contentious Jurisdiction (Gesetz über das Verfahren in Familiensachen und in den Angelegenheiten der freiwilligen Gerichtsbarkeit).