So as I have been gradually working my way backwards and making lovely charts of close and distant relatives, I'm realizing that once you have a known crossover, the Ahnentafel system gets all kinds of messed up. In my case, 2 grandchildren ended up marrying which caused the grandparents (& so on) to have 2 sets of Ahnentafel numbers. How to resolve this?! Do you just pick one set of numbers and stick with that or do you annotate with the 2nd number?