emberjs model reverse relationship unclear

I have a postal_address model that includes: street, zipcode, city, etc. I then have multiple unrelated models like Organization or User that have the postal_address as one of their attributes. The using-models simply refer to the postal_address as belongsTo, specifying the reverse is not clear to me, i.e. inside of the postal_address do I indicate anything in terms of models that refer to it?

Depending on the context, updating the address may affect the Organization, other times the User. There are many more models that could use the postal_address than the two I listed, in the event one suggests to duplicate the address-model per use-case.