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Oyinkan Braithwaite: My Sister, the Serial Killer (2019, Knopf Doubleday Publishing Group) 4 stars

"Satire meets slasher in this short, darkly funny hand grenade of a novel about a …

One well-dressed wife and three tall boys: the first two are now schooling in England, while the third is still in secondary school here. They reside in a townhouse on Banana Island—one of the most expensive estates in Lagos. He works in oil and gas. His photos are mostly of holidays in France, the U.S., Dubai, etc. They are every bit the typical upper-middle-class Nigerian family.

My Sister, the Serial Killer by 

What is the word “middle” doing in “upper-middle-class” here?