The answer is: Cousin

Colossians 4:10 - Some older versions have translated as sister's son (or nephew) but the Greek word here 'anepseeos' is the word for cousin and is translated as such in modern translations.

John Mark and Barnabas share a family tie that really adds depth to their dynamic in the early Christian church. The bond of cousins often carries with it a special camaraderie, especially since they both ventured into the challenging world of missionary work. Imagine the dialogue between them: what must their family gatherings have been like? Talk of faith, and the thrilling yet daunting mission undertakings that lay ahead!

It’s fascinating to note that this John Mark is often believed to be the author of the Gospel of Mark. So, in familial spirit, you can picture Barnabas inspiring cousin John Mark, who eventually documented many of the powerful stories they encountered on their journeys.

Renowned for its earnest discussions about teamwork, their relationship points to broader themes in the Bible—like unity and the beauty of collaboration found throughout scripture. Consider other familial associations in the Bible, such as the bonds between Ruth and Naomi, or David and Jonathan. Each relationship showcases how these personal ties facilitated important missions in spreading influence and goodwill.

Plus, the clashing perspectives between Paul and Barnabas, as they debated over taking John Mark along on their missions (see Acts 15:36-41), show how not all family ties are harmonious. Sometimes, disagreements lead us to broaden our horizons, forging different partnerships that still ensue vibrant witness to their shared beliefs. Grammar notes, connections, and engaging stories—not so different from our lives!