This is an excellent idea.
Of course it’s an excellent idea - scientifically objective and infallible - which is precisely why the open-borders lobbies are opposed to it. It’s a procedure that isn’t affected by time or complexity of relationships. For example, it’s resolved a 200 year old historical question - the relationship between Thomas Jefferson and Sally Hemmings. Some lunatics would do away with finger prints because they profile and discriminate against criminals!