Dear gR-list: The paper below might be interesting for people working on displaying graphs in R. (I have not tried anything out.) Pedigree-drawing with R and graphviz Jing Hua Zhao Bioinformatics 2006 22: 1013-1014. http://bioinformatics.oxfordjournals.org/cgi/content/abstract/22/8/1013?etoc --Mathias