According to his wikitree page.
Elvis Presley
https://www.wikitree.com/wiki/Presley-155
his paternal grandmother's maternal grandfather, William David Warren https://www.wikitree.com/genealogy/Warren-Family-Tree-1129
his paternal grandfather's maternal grandmother, Mary (Ligon) Anderson Rowlett
https://www.wikitree.com/genealogy/Ligon-Family-Tree-169
According to his wikitree page.https://www.wikitree.com/wiki/Anderson-30345#CHILDREN says there is no evidence that William Anderson and Mary Ligon had a daughter named Carolius Iudith who married Robert Warren Jr.
Elvis Presley
https://www.wikitree.com/wiki/Presley-155
his paternal grandmother's maternal grandfather, William David Warren https://www.wikitree.com/genealogy/Warren-Family-Tree-1129
his paternal grandfather's maternal grandmother, Mary (Ligon) Anderson Rowlett
https://www.wikitree.com/genealogy/Ligon-Family-Tree-169
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