Alice Munro 
Queenie (Storycuts) 

When Queenie elopes with a recently widowed neighbour her family are uniformly shocked, and a window on adult life and relationships is opened for her step-sister. A summertime stay with the newlyweds in Toronto yields further insight into the lives of couples, but also causes confusion.
Part of the Storycuts series, this short story was previously published in the collection Hateship, Friendship, Courtship, Loveship, Marriage.