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.
Chemical Weapons. 1  Approximately 19 million gallons of Agent Orange were used by the US military in southern Vietnam between 1962 and 1971. 2  Apart from the serious human health effects of Agent Orange - which include cancer and birth defects - the rapid loss of vegetation that it causes leads to severe soil erosion. This contributes to a major drop in species population due to habitat degradation.