I have Cepulis in my family and quite a lot of history on the clan near the Vilnius area, but no known relatives in the USA, outside of my immediate family. I found a record on Ellis Island data base on Alexandra Czepulaite, 21, arrived 11/1/1909, going to her stepbrother Jonas Marsaikas at 844 W. 33rd St Chicago. Coming from her dad Josas Czepulis in a town of Ruigola in Kowno district. Some of these spellings are hard to read, so my best guess. If this sounds like your relative, it appears her mother was married before.
The name Cepulis, is often recorded as Czepulis or Chepulis, as the letter C has accent over it, giving it a ch sound.