Many Star Trek characters have complicated relationships with their siblings. Although Star Trek: The Original Series did not dive too deeply into the family dynamics of its characters, subsequent Star Trek series have explored more complex relationships. While a few episodes of Star Trek: The Next Generation introduced the siblings of their main characters, they generally only popped up for an episode or two. However, Star Trek: Deep Space Nine’s stationary setting allowed for more serialized storylines, giving the show more time to spend developing its characters and their families.

https://screenrant.com/star-trek-best-sibling-relationships/