Oh, I see. Now I understand why it is painful to live in their house now. But a house is an inanimate object and it is within your power to make it more like your own place now, with your objects, your cleaning routines and supplies, your scents etc. Especially given that you have been trying to get rid of urine smell, it would make sense to infuse the house with something that smells good to you and was never present in the house when the parents inhabited it. I would just buy a collection of essential oils, a large brown glass spray bottle, and set out to experiment pouring some oil or a combo of oils into the bottle, filling it with water, and spraying it. I have done it for years and much prefer the scents I create to store-bought room deodorizers. The sense of smell is ancient and we are often moved by scents; a memory can be evoked by simply perceiving some aroma from decades ago. You can think of it as giving the house a new soul.