Maternal relationship is confirmed by an AncestryDNA test match between Simon Ross and his second cousin Living Taylor. The Most Recent Common Ancestors of these two relatives are their great-grandparents and grandparents, respectively, Percival Charles Powell and Florence Jane (Crampton) Powell. Their predicted relationship from AncestryDNA is 1st to 2nd Cousins, based on sharing 360 cM across 24 segments, with extremely high confidence. They are known to be 2nd cousins in real life.
Paternal relationship is confirmed by a GEDmatch test match between Simon Ross GEDmatch FL9451826 and his third cousin Nancy Bullen GEDmatch M965554. Their MRCA is their 2nd-great grandmother Mary Ann (Snow) Dillon and possibly their 2nd great grandfather Thomas Dillon, however, for the latter, it is likely least one of Simon or Nancy is not a descendant. The estimated number of generations to MRCA = 3.3, based on sharing 140.8 cM across 5 segments.