So... is Yosuga no Sora finished or not?
NO, it is not finished.
Why?
The anime finished after the manga:
Anime finished: December 20, 2010
Manga finished: November 25, 2010
... But MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Synopsis
After a tragic accident claims their parents, twins Haruka and Sora return to their childhood home in the countryside to start a new life.
Surrounded by familiar places and faces, they are forced to confront memories, both happy and sad, from their shared past.
As they reconnect with old friends and forge new relationships, their lives become intertwined with the lives of those around them.
The anime explores themes of love, friendship, and the complexities of human relationships as Haruka and Sora navigate their grief and try to find their place in the world.
The twins' bond is tested as they encounter various emotional challenges in their new environment, influencing their journey towards healing and self-discovery.