FTDNATiP™ allows you to incorporate your solid genealogical paper trail information on the earliest possible generation of a common ancestor into the DNA match calculations. For example, if you can exclude any chance of a common relative between you and another individual within (say) the past three generations, you enter this information, and FTDNATiP™ computes the time to common ancestry based on both the STR marker pattern and your information that the common ancestor must be at least four generations back.