Anatol Lieven in Politico:
In Afghanistan, kinship and tribal connections often take precedence over formal political loyalties, or at least create neutral spaces where people from opposite sides can meet and talk. Over the years, I have spoken with tribal leaders from the Afghanistan-Pakistan border region who have regularly presided over meetings of tribal notables, including commanders on opposite sides.
One of the key things discussed at such meetings is business, and the business very often involves heroin. When I was traveling in Afghanistan in the late 1980s, it was an open secret that local mujahedeen groups and government units had deals to share the local heroin trade. By all accounts, the same has held between Taliban and government forces since 2001.
The power of kinship led to a common arrangement whereby extended families have protected themselves by sending one son to fight with the government army or police (for pay) and another son to fight with the Taliban. This has been a strategy in many civil wars, for example, among English noble families in the 15th-century Wars of the Roses. It means that at a given point, one of the sons can desert and return home without fearing persecution by the winning side.
More here.