Joseph Elsik was the brother of John Elsik. He married Elizabeth Balnick (1871–1934).
Joseph and Elizabeth had three children:
- Annie Elcik (born 1902)
- Lizzie Elcik (1905–1988)
- Mary Elcik (born 1908)
The similarities between the Elsik and Elcik families—including shared given names, occupations, immigration patterns, and settlement in the same communities—have long raised questions about possible family relationships.
Joseph Elsik’s family plays an important role in understanding these connections and remains a key point of reference in ongoing research.