Becky Chambers writes charming science fiction novels that are primarily about all of the forms that love and family take, and Record of a Spaceborn Few is no exception.
Humans have long since left Earth and been integrated into Galactic society, but there are people who still live on the ships they first set out on, constantly improving and working on and changing those ships so people can continue to live comfortably on them. (And in a great touch: those ships are built from dismantled skyscrapers and other buildings and city structures from Earth – the Golden Gate Bridge or the Chrysler Building could be part of any ship.)
The plot comes from the fact that humans are relatively poor and technologically backwards and the Fleet is essentially that small town every teenager wants to leave for the big, exciting city. But there is also at least one person looking to come back, looking for a place to belong.
“All great literature is one of two stories; a man goes on a journey or a stranger comes to town.” – Tolstoy
(Not that the book is on par with Tolstoy, but the quote is relevant here.) Record of a Spaceborn Few is the story of the town and the people in it, full of warmth and love in many different forms. Definitely recommended.