The siblings were separated at a young age due to a Dres slaver raid, Blue, Cobalt, Ros-Ei & their mother were able to escape, Crimson & Bone weren't that lucky. Crimson was later "rescued" by some Orcs that later ambushed the House Dres Dunmers, unfortunately one Dunmer remained & sadly successfully brought the young Bone-Thuxis to the Dres plantation. Later an Imperial, a Tharn, bought Bone at a auction & later told he was free, the young Argonian sadly had no idea where to go & doesn't know if his family was still alive, so the Tharn adopted him into House Tharn. This family of Argonians finally reunited years later.