Jotaro said:I really look like a german: I have blue eyes, and my hair are blond as a bitch still today. :lol
Most Germans have brown hair.
Jotaro said:Is it true that if you prove that you have german ancesters, only then you can become a german citizen? My father, uncle, and I, tried to gather that.
Nono, this was the case under the Nazi-regime. Right now everybody can become a German citizen. Everything else would be ridiculous.
What your father was probably referring to is the more difficult situation of the so-called "Spätaussiedler". That is someone who still lives in the territories which were formerly belonging to Germany and are now Polish, Czech or Russian. Namely Prussia, Silesia (I'm half Silesian for example), Pommern, Königsberg (Kaliningrad) among others. If you can prove that you have German ancestors who lived in the boundaries of those regions during 1933-1945 you are eligible for a much easier and way faster immigration procedure. My parents used that law when they immigrated to Germany 30 years ago.