Citizenship Help

Hi, I am just wondering if it is possible for me to get citizenship by lineage through my great-grandfather.

great-grandfather

born in 1923 in Stuttgart, Baden-Württemberg

emigrated in 1928 to United States

grandmother

born in 1954 in United States

mother

born in 1990 in US

self

born in 2006 in US

Looking at it now I'm probably not able to but it is worth a shot just beacuse I found out recently that my great-grandfathers side is from Germany