Delphine Riley and Elodie Riley, representing Guernsey, compete against each other in the women’s 400 metres freestyle at the 2026 Commonwealth Games. Both sources report the same event and focus on the sibling matchup, with Delphine and Elodie racing in the same discipline during the Games. The coverage identifies the sisters by name and specifies the stroke and distance—400m freestyle—without adding further details such as their heat, lane, times, or results. The reports are consistent in describing the race as a direct competition between the two athletes at the Commonwealth Games in 2026. Aside from confirming the event and that both siblings participate, neither outlet provides additional context about their training, previous performances, or medal outcomes in the provided text. The key shared point across the sources is that the Riley sisters from Guernsey line up for the same 400m freestyle event, turning the race into an inter-sibling contest at the Games.