Many series books feature siblings who find their own respective love in successive books. Perhaps the best known is Julia Quinn's Bridgerton series, where eight Bridgertons eventually find their HEAs. Larissa Ione, Victoria Dahl, Nora Roberts, and many more have all written books featuring siblings.
If you have a sibling and read these books, chances are you've nodded or shaken your head at something the siblings have done or said.
Which author writes the most realistic sibling relationships in romance?