I have a Max Feinberg b. 1856 in Russia, married to an Anna Bernstein (I think) b. 1856 in Russia.
Abe Feinberg (my gg grandfather) b. 1875 in IL
Joseph Maurice Feinberg b. 1876 in IL
Harry Feinberg b. 1878 in IL
Bance Feinberg b. 1885 in IL
Morris Feinberg b. 1887 in IL
Otto Feinberg b. 1890 in IL
Lillie Feinberg b. 1894 in IL
I have very little information on Abe's siblings, but I do have a photo of Abe and one of Max I am more than happy to share. They are also available through my family tree if you'd like to see them.