OK, here is the trouble with the ahnentafel system. They did not plan for this to happen. The simple solution, just as when a marriage takes place, the bride usually takes the name of the groom. So too, then, the newly married couple takes the number system of the groom to continue with their children. The bride's number can be included, if desired, but for simple tracking, her name changed but not her number. That is her number. The children, are now born with the father's name and numbering system. The other solution is to include both numbers but it will have to indicate which line is which. That can be done by adding the first 3 initials of the last name to the number. For example: John Jones and Mary Price have numbers 4.8.2 and 5.2.4. You can do: JON4.8.2 and PRI5.2.4. In my vast lists of keeping numbers, one of our researchers uses a form of alpha-numeric code that takes the oldest person that can be documented, at least as of the first documented relative in the US. Take the first 3 initials of the last name, and being the first documented, he gets number 1. His kids, not the wife, get his initials and number 1, then they in turn get their number according to their birth order. So, what about the wife? She has her own system just like the husband, based on her family. So back to John Jones and Mary Price, John would be JON1 and his kids would be JON11, JON12, JON13. His grandkids would be JON111, JON112, JON121, JON122, JON131, JON132, if his 3 kids each had two kids. Works great to keep tabs on both where they fall in line and the order of births. Ah, ha, but what happens when you hit number 9 and need 10 or higher? Number 10 is A, 11 is B, all through the 26 letters of the alphabet. So after a long history, you may end up with a code like JON12114A2C6. At reunions its easy to pick out who you are related to by just looking at the code to see where they match up.