Thanks Tim, I was advised to do this kind of mapping and have also started doing the mapping. It is rather slow going :) Thanks for explaining IBD and IBS. I thought they were illnesses when I first saw that. Still didn't know what the initials stood for. I have drop box. Had not thought of putting my DNA info in there. Good suggestion. I appreciate it. Chris [email protected] wrote: > Dear Chris, > What I do is download the comparison data for the matches for my > parents, my wife's parents, my wife, and me periodically. You do this from > the chromosome browser web page, then select 5 people, and then click on > "Download to Excel" in the right lower corner of the web page. You can > unfortunately download the data for 5 people at a time. The first time you > do this you have to do it for all of your matches. Subsequently, you only > have to do this for new matches. You then have to merge all of the > downloaded data files into a single file for each person you have an account > for (in my case 6 people). I then sort each of these files by the number of > cMs in the matching segment and discard all matching segments less than 3.5 > cMs. My belief is that a relatively low portion of the matching segments > (HIRs) less than 3.5 cMs will be identical by descent (IBD) and that most <snip> Tim Janzen