Autosomal DNA: Close Relationships / Triangulation (paternal). All three children of R.V. are extremely high confidence matches of descendants of R.V.'s paternal aunt (Mollie Massey) and great-uncle (Jefferson Massey) at Ancestry.com. Segments in common with a descendant (GEDmatch A892391) of another paternal great-uncle (William Levi Massey) that can be triangulated with FTDNA and 23andMe matches related to the Massey and collateral lines further back. Likewise, segments in common with descendants of paternal grandmother's family at 23andMe triangulate to related lines further back (FTDNA/23andMe).
Autosomal DNA: Close Relationships / Triangulation (maternal). All three children of R.V. have triangulated segments (at FTDNA) in common with descendants of maternal grandmother's maternal South cousins as well as triangulated segments in common (at FTDNA/23andMe) with descendants of maternal grandfather's Williams cousins. All children of R.V. are also extremely high confidence matches to descendants of R.V.'s mother's first cousins.
It may be possible to confirm family relationships with Robert by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Robert: