A pedigree that not only shows the parental lineage (parents, grandparents etc.) but also shows related cats in the pedigree (cousins and their offspring, grandparents litter mates and their offspring, etc.). It is a tool to delineate genetic disease. A genetic pedigree can be as simple as close relative (parents and their litter mates and offspring) to as complex as a 20 year pedigree of a family, listing 100's and 100's of relatives and their litters produced by all matings. A geneticist pedigree marks carriers, multiple traits, death, birth dates using standard symbols.