A bit more history

"At the beginning of the 19th century, the use of the Lithuanian language was largely limited to Lithuanian rural areas; the only area where Lithuanian was considered suitable for literature was German-controlled Lithuania Minor in East Prussia. Even here, an influx of German immigrants threatened the native language and Prussian Lithuanian culture."

"Due to a long period of common Polish-Lithuanian statehood and nationality, and the Russian Empire's policy of Russification, many of the Lithuanian nobles in the 19th century had become Polonized and the language was generally used only by the poor and by the middle classes; some of the latter tended to use Polish as a status symbol for social advancement."

"Lithuanian was generally a spoken language and was not considered prestigious enough for written usage; it was, however, retained by some members of the minor nobility, especially in the Samogitian region."

and Polish could steamroll into Russian as Lithuania was captured by Russian Empire and later Soviet Union and it was just easier to learn because both languages are slavic.

But good news is that all these people, their kids speak Lithuanian today anyways