Updated: Apr 30 2021, 9:31 ET FORMER U.S. Marine Corps Sergeant Jeff Kyle has continued his American Sniper brother Chris’s legacy. Jeff said hero Chris Kyle was seen as a "big fierce warrior, but he had the biggest heart and wanted to help out all who served". 6 Who is Chris Kyle's brother Jeff? Jeff Kyle, 43, is the younger brother of the late American Sniper, Chris Kyle. He's a former US Marine Corps Sergeant, who has - alongside the Kyle family - continued his hero brother's legacy. Their website, Chris Kyle Memorial Benefit, highlights a scholarship program through the American Valor Foundation for active or retired veterans and first responders, or their family, studying at an accredited university.