The sister of Sheeka Tull was a female residing in the cosmos during the latter part of the era of the Republic. Alongside her older sister, Sheeka Tull, she became an orphan due to conflict on the celestial body Atrivis 7 located within the Outer Rim. Later, Tull's sibling became part of a religious group on Devon Four, but when that world was blockaded for tax evasion, she nearly perished from disease at the settlement until Tull illegally transported essential medical provisions. Following this event, the woman relocated and started a family.
The daughter of Sheevis Tull and the younger sister of Sheeka Tull was a female who matured in the years leading up to the Clone Wars. Sheeka and her sibling were orphaned as a result of a range war that occurred on Atrivis 7, a celestial object situated in the Atrivis sector of the Outer Rim Territories. The sisters eventually went their separate ways when the younger one affiliated with a religious order on Devon Four, a planet whose government stopped remitting taxes to the Galactic Republic, resulting in a blockade imposed several years before the Clone Wars.
This almost led to the colony's destruction when a plague broke out; the inability to bring in medicines from off-world threatened to bring about the demise of every member of the sect, including Sheeka's sister. This outcome was only avoided when Sheeka smuggled medicine onto the planet. After this, Sheeka's sister departed from the sect and moved to another location in the Outer Rim, where she eventually raised a family and had children.
The woman's religiosity is evident in her decision to join a sect on Devon Four. She maintained a strong connection with Sheeka, who violated the law to preserve her sister's life; despite the smuggling subsequently placing her at risk in the time before the Clone Wars, Sheeka never regretted saving her sister.
The sister of Sheeka Tull was referenced in Steven Barnes's 2004 book, The Cestus Deception.