John, don't worry (or anticipate!) too much on twins! My maternal grandfather was a twin, and so was my father. But my parents had only two children, my sister had two, Ed an I had nine (we lost the last little girl), and now most of our children have only two apiece, and a couple have none. There are ten grandchildren, (poss more in the future as our younger son is getting married in May and they both really want kids). Of our grandchildren, three of the boys have children, but not a set of twins to be found! And I've found twins somewhere in about a quarter to a third of each of our lines, especially the Cleveland side (my maiden name). So don't worry (or wish!) too hard! Barbara in MO