Looking for Grant's...

I am researching my Grant Family Genealogy.Unlike most of the Grant's I have found, we supposedly come from Germany.I do not have a lot of information, since I have not been doing this long. The earliest known family member is William Frederick Grant b. Oct. 11, 1835 in Germany, d. Aug. 16, 1917 in Battle Creek, MI. Married to Doretta Salk b April 30, 1837 in Germany,d Feb. 6, 1919 in Battle Creek, MI.They came to the US late in 1866, landing in Castle Point(?) NY.Lived in Buffalo, NY until around 1900 when they moved to Battle Creek, MI.They had 9 children, Frank b. ?, Charles S. b. 1/11/1867, John b. 10/28/1868, Henry b. 12//23/1870, Anna b. 8/16/1872, Louise b. 9/16/1876, William b. 9/16/1876, Albert b. 9/15/1878, Mary b. 1/10/1880.Any information on any of these people would be greatly appreciated.