5 homes is likely rare, but I don't think 2 is extremely uncommon. Like vacation home where family might spend summer or working at different city than where family and coming home for weekends. In Finland over 10% of people have a cabin and in average they spend 79 days of the year there (https://suomenkuvalehti.fi/kotimaa/yli-puoli-miljoonaa-kesam...) though I'm not sure how common it's to have electricity these days.
Most people would consider someone with five homes as very rich, but you could get relatively close with only moderately excessive wealth and a divorce. Each parent owning a vacation home, perhaps.
