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.
:) have been trying to find current information on Viet Nam Veteran's and the effect Agent Orange had on them. My father died in 1991 at age 60 after 2 1/2 years of terrible illness which I attribute to Agent Orange. He was a career soldier, served two tours in Nam as an infantryman and Green Beret.