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Since he is in a nursing home I assume that it is seldom your responsibility to get him to change pants. The staff there should be very well experienced with this kind of thing. I doubt they ask him if he wants to change. :)
Don't try to talk him out of thinking he can marry and go home. His reality is not yours. Use those statements to start a different conversation. Talk about when you first got married or your son's wedding or ask him about his wedding. Did they get gifts? Can he remember any of them. Start out on a topic somewhat related (weddings) and then perhaps ease into how much household appliances have changed.
This is not easy, but the fact that others are doing the day-to-day hands-on caregiving should help you a lot!