I am trying to help an adoptee determine his birth parents based on DNA matches at different sites. I became involved because he is a 1st-3rd cousin DNA match to many people in my extensive family tree. To help sort through the data, I would like to create a family tree diagram (online or on paper) that only includes people whose DNA has been tested, or their common ancestors. I am willing to mark which people I wish to include in the tree. Is there software that will help me create such a tree, ideally using my gedcom file?