Mich. Comp. Laws § 700.5105
The court has jurisdiction of the matter described in this section. If authorized by order of the court that has jurisdiction of the prospective donor, a person 14 years of age or older may give 1 of his or her 2 kidneys to a father, mother, son, daughter, brother, or sister for a transplantation needed by the intended donee. A guardian, parent, spouse, child, or other next of kin of the prospective donor, other than the intended donee, may file a petition for an order under this section. If the prospective donor does not have a guardian, the court shall appoint a guardian ad litem to protect the prospective donor's interests. The court shall hold a hearing on the petition and cause notice of the hearing to be given. The prospective donor shall be present at the hearing and shall be examined by the petitioner or the court, or both. If the court determines that the prospective donor is sufficiently sound of mind to understand the needs and probable consequences of the gift to both the donor and donee and agrees to the gift, the court may enter an order authorizing the making of the gift.
MCL 700.5105