(1) Subject to subsection (1A) and section 4B, in deducing any relationship for the purposes of this Act, the relationship between every person and his father and mother shall, subject to section 27A of this Act (inserted by the Act of 1987), be determined in accordance with section 3 of the Act of 1987, and all other relationships shall be determined accordingly.

(1A) In deducing any relationship for the purposes of this Act, the relationship between every donor-conceived child (within the meaning of the Act of 2015) and his or her parents shall be determined in accordance with section 5 of the Act of 2015 and all other relationships shall be determined accordingly.

(2) Subject to subsection (2A) (inserted by section 65(d) of the Act of 2015), where a person whose father and mother have not married each other dies intestate, he shall be presumed not to have been survived by his father, or by any person related to him through his father, unless the contrary is shown.

(2A) The reference to father in subsection (2) does not include a man who is, under section 5 of the Act of 2015, a parent of the first-mentioned person referred to in that subsection.