Oregon Revised Statutes:
93.180 Forms of tenancy in conveyance or devise to two or more persons. (1) A conveyance or devise of real property
, or an interest in real property, that is made to two or more persons:
(a) Creates a tenancy in common
unless the conveyance or devise clearly and expressly declares that the grantees or devisees take the real property with right of survivorship.
(b) Creates a tenancy by the entirety
if the conveyance or devise is to a husband and wife unless the conveyance or devise clearly and expressly declares otherwise.
(c) Creates a joint tenancy as described in ORS 93.190 if the conveyance or devise is to a trustee or personal representative.
(2) A declaration of a right to survivorship creates a tenancy in common in the life estate with cross-contingent remainders in the fee simple.
(3) Except as provided in ORS 93.190, joint tenancy in real property is abolished and the use in a conveyance or devise of the words “joint tenants” or similar words without any other indication of an intent to create a right of survivorship creates a tenancy in common. [Amended by 1983 c.555 §1; 2007 c.64 §1]
is an Oregon case that discusses partition rights of tenants in common.
If your name is XXXXX XXXXX recorded deed to the property as a tenant in common, the other owner has no right to exclude you from the property. If the police will not help you with this (and they may actually do nothing other than tell you it is a civil matter) you will need to find an attorney in the County where the property is situated.
It is possible that receiving a letter from an attorney might make the other owner act more reasonably. If not, you may have to sue for an accounting and possibly for partition and ejectment.
You can look for a local real estate
lawyer at http://lawyers.nolo.com/
I hope this information is helpful.