Uncle Olaf Greyshoulders is a non-player character who lives on Viking in the Tichel system. He served on the original Unrelenting under Morgan Greyshoulders (the player's father) before the ship was destroyed in an ambush and Morgan and his wife were killed. The player (an infant at the time) was entrusted to Olaf to be taken care of.
It is unclear if Uncle Olaf is actually a blood relative of the player or not.
Uncle Olaf also plays a major role in the so-called Pirate mission string, as he gathers up the old Unrelenting crew to build a new Unrelenting for the player. He also helps the player rebuild the Association of Free Traders and eventually bring down McGowan.