I don't know if this helps any, but I too come from the Gass family of Rothenfluh, Kanton Basel, Switz, twice. The farthest I can go back, and you've probably heard of these, is Stephan who died in 1541 or about that and Michael, born about 1505/1510. Does anyone know if these two men are brothers or where their lines connect? I also come from the Keller family of Rothenfluh, who so far, comes from Matthias Keller born about 1545. And also the Märkli family who comes from there, as well as the Gräf family. Does anyone have info on Anna Gräf who married Hans Gass of Rothenfluh? I come from another Gräf family, from the Zurich area. Can anyone help?