(1)  For all purposes of the law of the State the relationship between every person and the person's father, mother or parents (or any one of the person's father, mother or parents) shall be determined irrespective of whether the person's father, mother or parent are or have been married to each other and all other relationships shall be determined accordingly.

(2)  The rule of construction whereby in any instrument words of relationship signify only legitimate relationship in the absence of a contrary expression of intention is abolished.

(3)  For the purpose of construing any instrument the use, with reference to relationship of a person, of the words "legitimate" or "lawful" shall not, in the absence of intention to the contrary in such instrument, prevent the relationship from being determined in accordance with the provisions of subsection (1) .

(4)  This section shall apply in respect of every person, whether born before or after the commencement of this Act, whether born in the State or not, and whether or not the person's father, mother or either of the person's parents has ever been domiciled in the State.