(2) Grandparent or older individual who is a relative caregiver The term grandparent or older individual who is a relative caregiver means a grandparent or stepgrandparent of a child, or a relative of a child by blood, marriage, or adoption, who is 55 years of age or older and
(A) lives with the child;
(B) is the primary caregiver of the child because the biological or adoptive parents are unable or unwilling to serve as the primary caregiver of the child; and
(C) has a legal relationship to the child, as such legal custody or guardianship, or is raising the child informally.