let me know if you have the same family ancestors
For most Geni users is is difficult to tell since you are not a part of the world-tree yet. http://www.geni.com/worldfamilytree
I do however notice a duplicate message to the world tree as close as on your grandfather, and if you approve a merge there you will get as many as 75,514,176 relatives ;-)
http://www.geni.com/merge/compare/6000000025005467995?to=6000000011...