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>I am looking to find descendents of Kaiser Wilhelm II. It has been rumored through our family that we are distant relations, but I have yet to find the connection. Our German last name was von Rundstedt but was changed to Rundt when ancestors immigrated. Any info would be greatly appreciated!
The easiest and best print source for the descendants of Wilhelm II, German Emperor and King of Prussia (aka Kaiser Wilhelm II) is to get yourself a copy (either through purchase or through an inter-library loan) of *Queen Victoria's Descendants*, by Marlene A. Eilers (Rosvall Royal Books, 1997). As Wilhelm II was a grandson of Queen Victoria, all of his descendants are found in this publication.
If you cannot locate a copy of this excellent book, you might want to use a reliable online source called "An Online Gotha", by Paul Theroff, at this URL: http://pages.prodigy.net/ptheroff/gotha/gotha.htm
Once there, click on the link marked "Prussia", and scroll down until you find "Wilhelm II".
First, you phrased your subject line as "Kaiser Wilhelm lineage", but ask for "descendents of Kaiser Wilhelm II" in the text body. Lineage refers to someone's *ancestors* (those who came before him/her), whereas *descendants* are just that, descendants (those who came after him/her who are descended from that person's body).
Second (and this is going to burst your balloon), there are no "von Rundstedt" or "Rundt" among the descendants of Wilhelm II. The von Rundstedt family was an untitled aristocratic Prussian family(*). (This means they were aristocrats or nobles, but without a title such as baron (Freiherr, in German), count (Graf, in German), etc...) To the best of my knowledge, none of its members married into the Kaiser's family because the royal Prussian family (and later, the imperial German family) had very strict marriage laws. One had to be an equal to marry a prince of that family, that is, one had to be a princess from another royal family.
(*) For information on what it means to be a German noble or a German aristocrat, see http://www.heraldica.org/faqs/atrfaq.htm#p3-2
Finally, for genealogical information about the von Rundstedt family, see a series of German-language books called *Genealogisches Handbuch des Adels*. The specific volume you'll need is 49: AA XI 1971. Any number of large public libraries or university libraries would likely have this series of books, commonly abbreviated as GHdA.