Brian   Clark
From the Penguin Arkana Contemporary Astology Series, edited by Erin Sullivan, an exploration of siblings, and the sibling archetype, through the lens of astrology, psychology, and mythology. Brin Clark examines early psychological theories of Freud, Jung, and Adler, as well as how these thinkers may have been influenced by the sibling dynamics within their own families. Part 2 goes into sibling dynamics in astrological charts. The basic thesis is that all family members influence one another (and that apparently this influence may show up on the natal birth charts and transits).
Esoterica,Astrology
The Sibling Constellation