famoz (an acronym for father/mother) is a software useful in reconstructing parentage for dominant, codominant and uniparentally inherited markers. It is written in C and TclTk languages and is available for Unix, Linux and Windows systems at http://www.pierroton.inra.fr/genetics/labo/Software/Famoz/index.html. Parameters and assumptions used in the calculations are few and simple. Exclusion and identity probabilities, log-likelihoods of any genetic relationship, potential father and parent or parent pair, half- and full-sibship are calculated based on real or simulated data. Error rates for genotypic mistyping can be introduced. Simulations can be done to build statistical tests for parentage assignment.