Are human beings matter or psyche?

I thing that humans are matter because if there are only psyche we could not see, but also the psyche and the matter have a relacion because the matter can work without a psyche but with the matter work best, it's like a car, the matter is the body frame or chassis, and the psyche is the motor....( and the keys are the brain)
but we are matter because... because sometimes we do not need the psyche to do the things the only thing that we need to do the things is the brain and the brain is matter not psyche. there is the answer, the brain is everyting... (but for some persons not because they do not use it)

How can something be someone's property

I think that an object belongs to someone when that person proves that he has power over that thing and can defend it and can prove that this object is of he through any bill or any evidence, because if it does not prove someone that believes that have more power can say is theirs and may steal and the real owner (he has not such power) can ensure that is theirs but no one will believe him.
also there are laws, for example: you can change a property for money, and this property and that's not your now belongs to the other person.
also in the land properties you have to pay taxes because this shows to the government its yours.