"A is for Aunt Amy and Aunt Anastasia"

Sherry, Amy, Anastasia. Each grew up with a brother or two, but each without a sister.
. . . .
Now Sherry's brothers have married (well, ALMOST married, in Tom's case) wonderful women.
. . . .
And Sherry, Amy, and Anastasia now each have two terrific sisters, ready made, without any of the usual sibling struggles.