Lithuanian and Latvian languages are not Slavic and not Balto-Slavic. I made a deep esearch and I can say that both Baltic languages are definitely not Slavic, not even close, and neither Balto-Slavic. They should be separated into a very early separation branch similar to Armenian. There are very few Slavic-sounding words in both Baltic languages and those words were borrowed in near modern times. All other words (99,999999%) in both Baltic languages don't even remind of any Slavic language. There are words that sound Arabic, Franco, Latin, Greek, even English and Italiamn and even Pacific, but very few Slavic...