Thanks for the clarification. How did you obtain the 1916 marriage information?
I checked the Lithuanian Telephone Directory at www.118.lt
for JUSKAIT and got 62 hits including:
Juškaitė (unmarried female spelling)
Juškaitytė (alternative unmarried female spelling)
Juškaitienė (married female spelling)
Juškaitis (male spelling regardless of marital status)
There are few in the area around Jurbarkas though many potential relatives may have moved to the Kaunas or Vilnius area due to urbanization.