The Whitesun family bloodline included the siblings Beru, Dama, Haro, and perhaps Coolie.
When Anakin Skywalker became Darth Vader, his son, Luke Skywalker, was cared for by Beru and her husband, Owen Lars. Owen and Beru, whom Luke called "Uncle Owen" and "Aunt Beru," were killed by Imperial stormtroopers in 0 BBY.
The name Whitesun originally appears in a similar form as the surname of Clieg Whitsun in the rough draft of the original film.