2005 California Health and Safety Code Sections 8625-8629 Article 2. Joint Tenants

8625.  In a conveyance to two or more persons as joint tenants each
joint tenant has a vested right of interment in the plot conveyed.
8626.  Upon the death of a joint tenant, the title to the plot held
in joint tenancy immediately vests in the survivors, subject to the
vested right of interment of the remains of the deceased joint
tenant.
8627.  Cemetery property held in joint tenancy is exempt from the
provisions of the Probate Code relating to proceedings for
establishing the fact of death of a person whose death affects title
to real property.
8628.  An affidavit by any person having knowledge of the facts
setting forth the fact of the death of one joint tenant and
establishing the identity of the surviving joint tenants named in the
deed to any plot, when filed with the cemetery authority operating
the cemetery in which the plot is located, is complete authorization
to the cemetery authority to permit the use of the unoccupied portion
of the plot in accordance with the directions of the surviving joint
tenants or their successors in interest.
8629.  When there are several owners of a plot, or of rights of
interment in it, they may designate one or more persons to represent
the plot and file written notice of designation with the cemetery
authority.  In the absence of such notice or of written objection to
its so doing, the cemetery authority is not liable to any owner for
interring or permitting an interment in the plot upon the request or
direction of any coowner of the plot.