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.
Many returning veterans faced negative reactions from both opponents of the war (who viewed them as having killed innocent civilians) and its supporters (who saw them as having lost the war), along with physical damage including the effects of exposure to the toxic herbicide Agent Orange, millions of gallons of which had been dumped by U.S. planes on the dense forests of Vietnam.