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.
It was apparently based on an estimate that 800,000 Vietnam-era veterans had died by 2000. That number was reasonable: About 9.2 million Americans served in the military during the Vietnam era (1964-75), so that would mean about 8 percent of them had died and 92 percent were still alive.