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If son moved into the tenant's dwelling, then he is a subtenant and the tenant is actually his landlord. Under Michigan law, if there is no written lease, then this is a month to month tenancy and either party can terminate the tenancy with a written 30 day notice. See Mich. Comp. Laws § 554.134
If son doesn't vacate, then the tenant (his lanldord) will have to file a formal eviction action in court to get a judgment and a writ against him that the sheriff will execute to force son to move out.
So if your question is can the tenant evict son, the answer is yes as long as he follows the proper legal process to do so.