The will of Robert Bailey, written 4 Oct 1712, mentions (among others) his mother Elizabeth Tarver, his [step-]sister Sarah Boyce, his [step-]sister Mary Tarver, and Samuell Tarver.
This same will is quoted in Southside Virginia Families, 2:24, but with the name Sarah Tarver instead of Mary Tarver. Since it appears that the marriage of Samuel Tarver to Mary Boyce is accepted, it is assumed that Southside Virginia Families has a transcription error.