For me I would say “The Expanse” is a huge one. If there was ever a self made family, the crew of the Rocinante is one of the best. The amount of time they spend together and how they congeal into life long partners and friends in the face of some truly awful events is really inspiring to me.
All of Octavia Butler’s books. Not that all the stories are uplifting tales, not by a long shot. But the perspectives of the characters are rooted in family, she explores the ideas of family a lot.
‘The Lurking Fear’ by HP Lovecraft is about family. Actually a lot of his stories are. Just never in a good way.
For a less snarky answer I’d go with the original Star Wars trilogy as a good answer. Yes, I know the meme phrase regarding this, but it’s true that what elevated the trilogy above mere space adventure was the reveal (retcon, but who is counting) of Darth Vader and Luke’s connection. It gave the entire conflict a real sense of weight. The showdown in Return Of The Jedi where Luke cracks and goes beserk, followed by Vader sacrificing himself and unmasking is really great emotional closure for that story.
I recall Becky Chambers’ “A Long Way to a Small Angry Planet” emphasizing the found family theme pretty heavily over the course of the story, especially non-traditional relationships. In fact, the ship crew’s relationships with one another forms the crux of the drama. Even though there are big “Important” events happening in the background, the narrative is focused on what those events mean for the characters on the ship, rather than what they mean for the galaxy as a whole.
This image remind anyone else about antitaco legislation?
“The Varkosigan Saga” follows generations of family Varkosigan, and their friends-become-family.
Unforgettably eventually arriving at “Miles, where have you left your brother?”
Spoiler for late in the series:
Title
A main character has to deal with an illegally created clone meant to assassinate and replace him…and realizes that his mother will expect him to bring his “new brother” home safely at Christmas, once she learns that the clone exists.