how long does next of kin have to claim belongings of someone who has died

Question Details: my uncle has live with my parents for the last 2 years of which time his children have not made any attempt to contact him now that he has passed they want all of his stuff and that is fine but what we need to know is how long do we legally have to give them to come and get it before we can do anything with it we live in michigan and his children live in ohio Important Notice