The family of Catherine Alexander and Joseph Rust has been difficult to trace, but I found names through son Robert W.'s will. I will leave them after attempting to get the names and approximate birth years for their children. I don't knowthat any of the ages are correct, but I have attempted to give the ranges I have found for the offspring.
Her gravestone inscription states that she was the wife of Joseph B. Rust and that she died 1 April 1858, aged 69 years. This implies a birth date of 1788 or 1789, probably correct if Robert W was born around 1806 as one of his reports of age implies or if Margaret was born around 1808. The sometimes seen birth date of 1797 or 1798 is too late for her to have a child in 1806 or 1808.
Robert's willNote 1 with brother Peter E. as executor makes bequests to: O. L Rust., youngest brother, Dellah S.Rust, niece, Margaret Rust, Elizabeth Rust, John Rust, P. E. Rust, O. L. Rust, Mary Davis, wife of Jesse Davis, Angeline, wife of John Wilson, and Cintha Shaw, wife of C. T. Shaw. Stephen Smith and wife were mentioned but were never supposed to get one cent of the estate.
Note 1: Link for Robert's will"United States Census, 1860", FamilySearch (https://familysearch.org/ark:/61903/1:1:MZMY-1T7 : 18 February 2021), Joseph B Rust, 1860. Note: not part of Joseph's household but listed just above were Peter and Oscar. Be aware that the ages listed for Peter and Oscar cannot be correct since Oscar was mentioned in brother Robert's will as his youngest brother.