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.
From 1962 to 1970, the US military sprayed 72 million liters of. herbicides, mostly Agent Orange, in Vietnam. Over one million. Vietnamese were exposed to the spraying, as well as over 100,000.