The ownership a page object has
Assembly: EPiServer.dllVersion: 11.20.7
public enum OwnerOption
The page object is owned by the page. All versions/languages of a page will share the same page object
The page object is owned by the page language branch. All versions of a page with the same page langauge will share the same page object
The page object is owned by the page version. Each version of a page will get its own copy of the page object.