calabash cousins AmE potocznie

The use of the calabash in Hawaii has led to terms like "calabash family" or "calabash cousins", indicating an extended family grown up around shared meals and close friendships.

There was a good deal of chivvying to see which of his friends would win the favors of the charming sisters, and of course in later years his younger sister became engaged to one' of her calabash cousins, a Whipple, whereupon Hoxworth's father told the family, "I think it's high time somebody married a stranger."