Mich. Comp. Laws § 700.7304: Representation by person having substantially identical interest.

Sec. 7304.

Unless otherwise represented, a minor, incapacitated, or unborn individual, or a person whose identity or location is unknown and not reasonably ascertainable, may be represented by and bound by another having a substantially identical interest with respect to the particular question or dispute, but only to the extent there is no conflict of interest between the representative and the person represented.