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I think this is demential. Depression does not have such fantasy or illusion.   My father-in-law who has stage 6 Alzheimer's was once very stubborn about his toilet in early 2007. He had mid-Alzheimers at that time. He insisted that the water pipes were connected to the neighbors in a way that the water can flood from the toilet to the bathroom and etc. The fact was he was playing with the toilet and "pushed and pushed" until the water flooded the bathroom. The caregiver had to wash it off at least twice. He also covers up the toilet thinking the water would come out of it! It was quite crazy and he even peed into the sink next to it once trying to "fix this problem". He even told my husband how the pipes were over there in the front yard all the way to the end of the block and so the water will come up to flood the house!! So the caregivers made sure the bathroom is clean with strong chemicals.   Well it took about 2 or 3 months for this to pass. Now he still covers up the toilet after he uses it. He sometimes thinks this neighborhood/block is all connected like a community so the neighbor has to care for him or something. (he is in his own house now.)   Maybe your father should try the dementia drugs like aricept or namenda? These drugs are quite powerful to keep the patient calm.   Regards, Nina