As used in these rules the following definitions shall apply:
The definition for an Indian child's "extended family member" shall be in accordance with the Indian Child Welfare Act. The Act states that an extended family member shall be as defined by the law or custom of the Indian child's tribe or, in the absence of such law or custom, shall be a person who has reached the age of eighteen and is the Indian child's grandparent, aunt or uncle, brother or sister, brother-in-law or sister-in-law, niece or nephew, first or second cousin or stepparent.
10-148 C.M.R. ch. 16 and 15, § 1