(1) Parental lineage and the degree of relationship between an adopted child on the one hand and the parent by adoption and their blood relatives and relatives by affinity on the other, shall be deemed from the time when an adoption has been made, the same as those of a child born while the father and mother are in matrimonial relations.
(2) The degree of relationship of the spouse, lineal descendant and the spouse of such lineal descendant, of the adopted child shall be determined upon the basis of the parental lineage of an adopted child as prescribed in paragraph (1).