Cyrus Herbert Simpson is Abe's older brother. Cyrus was born in Scotland (he is not Scottish because he does not speak with a Scottish accent) but emigrated to the USA as a child with his family. They were both Navy pilots in World War II, serving together before the Sullivan law was enacted to prevent this. It is unknown if Abe Simpson was assigned to the Flying Hellfish before or after this. Cyrus's plane crashed and was not seen for years after. Cyrus remained in Tahiti where he retired. He now lives with his 15 wives, which he mentioned to Abe Simpson.