ownership of home when one owner has died not married couple

I assume that you and the deceased partner were tenants in common on the deed.  I also assume that the sibling of the deceased inherited his ownership interest in the house through either a will or intestate administration of the estate. Therefore, you and the sibling are tenants in common today.  That means that either of you is entitled to use the property, and neither can exclude the other from its use.  You are equal owners.  As to personal property, that is still yours and he cannot deal with your personal property in any way - move it, store it or sell or dispose of it - without your consent. You and he will have to come to some arrangement as to what you will do with the house.  If he wants to live there, he needs to compensate you for half of a fair market value rent - he is not entitled to live there for free.  If he leases it out to a tenant, you are entitled to have the rent - although you would also be obligated for half the cost of upkeep.