Moved from a large house to live with our son in a much smaller bedroom, but we pay the mortgage

Without getting into too much detail, we lived in a very liberal state and the politics, prices and crime made it no longer desirable to live there. We made our nice with a lot of upgrades then rented it and moved to another state where our son lived in a house we are paying for. Thought rent one share mortgage with our son. Life make different choices for you though. We moved, our son lost his job and is now working for a much lower wage. So now my wife and I are paying full mortgage on the new house, food, garbage, water, sewer, etc. Our son does not help with the mortgage, The venting part is that when we moved we got a very small bedroom for 2 (my wife and I) where we can barely fit around our queen bed. Our son still occupies the master bedroom with a really nice bathroom with double vanity. Since we pay full mortgage and utilities I felt like we should get that room but did not make him move. Now I am feeling resentful. If he helped with the mortgage I would not care, but he does not. This is only for another year then we are retiring.