So we keep going over how eventually as time goes on blood gets diluted and descendants are less likely to see Dipper. But then there’s the headcanon that the Hank and Acacia’s spouses and the pleiades become able to see him even without a blood relation. I like to think that his visibility to them relied more on how much he thinks of them as family and interacts with them instead of actual blood. He probably wouldn’t interact as much as time went on, but those he does can see him still.