Half siblings definitely looks like a good possibility--the cousins look like cousins, the aunt looks like an aunt, and the suspected half sibling looks like a half sibling--all of those people came up in the range you'd expect to see.
Network President Jenny LeFevre, Agent Orange Victims and Widows Support Network, attributes more than 250,000 deaths to Agent Orange, a toxic herbicide the U.S. military sprayed over Vietnam from 1962 to 1971.
Agent Orange is the name to which all herbicides are referred (technically) in error during the Vietnam War. The name, Agent Orange, has become synonymous for, and collective of, all herbicides used during the Vietnam War. Agent Orange, is also the term for the harmful effects of herbicides (again, in error).