(1)  To the issue of the decedent; if they are all of the same degree of kinship to the decedent they take equally, but if of unequal degree, then those of more remote degree take by representation;

(2)  If there is no surviving issue, to the decedent's parent or parents equally;
 

(3)  If there is no surviving issue or parent, to the brothers and sisters and the issue of each deceased brother and sister by representation; if there is no surviving brother or sister, the issue of brothers and sisters take by representation;or
 

(4)  If there is no surviving issue, parent, or issue of a parent, but the decedent is survived by one or more grandparents or issue of grandparents, half of the estate passes to the paternal grandparents if both survive, or to the surviving paternal grandparent or to the issue of the paternal grandparents if both are deceased, the issue taking equally if they are all of the same degree of kinship to the decedent, but if of unequal degree those of more remote degree take by representation; and the other half passes to the maternal relatives in the same manner; but if there is no surviving grandparent or issue of grandparent on either the paternal or maternal side, the entire estate passes to the relatives on the other side in the same manner as the half.

(1)  An adopted person is the child of an adopting parent and not of the natural parents except that adoption of a child by the spouse of a natural parent has no effect on the relationship between the child and that natural parent; and

(2)  In cases not covered by subdivision (a)(1), a person born out of wedlock is a child of the mother. That person is also a child of the father, if:

(A)  The natural parents participated in a marriage ceremony before or after the birth of the child, even though the attempted marriage is void; or

(B)  The paternity is established by an adjudication before the death of the father or is established thereafter by clear and convincing proof, but the paternity established under this subdivision (a)(2)(B) is ineffective to qualify the father or the father's kindred to inherit from or through the child unless the father has openly treated the child as the father's, and has not refused to support the child.