The Corellian Trilogy by Roger McBride Allen
When Han and Leia return to Han's home planet of Corellia 14 years after Return of the Jedi, they find themselves caught up in a dangerous spy game even as the Corellian system threatens to erupt into civil war. But it gets worse: A mystery left by an ancient civilization could put an unimaginable superweapon into the hands of brutal insurgents, led by none other than Han Solo's long-lost cousin!
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Book 1: Ambush at Correllia
Book 2: Assault at Selonia
Book 3: Showdown at Centerpoint
This is a post-Return of the Jedi series from the Legends timeline. Think of it as an alternate universe from The Force Awakens and newer books.