As a native Latvian speaker, I have no idea what you're talking about. In comparison to other languages spoken on the European continent, Lithuanian and Latvian have retained more of the features of what linguists call Proto-Indo-European (PIE), a language spoken circa 3500 BCE. It was certainly not "designed by Germans as 'slave language'". Perhaps that's what you were taught during the "ommunist" times under the Soviet occupation. Incidentally, this was also a time of Russification[1], i.e., marginalization of languages spoken by the native population. You can see how this would fit nicely into their narrative. Latvian speakers today, though, would really appreciate if people could stop spreading such falsehoods. That'd be really nice too, Jevgēnij.