Ori is the youngest brother to Dori and Nori. He was also the apprentice scribe to Balin. He went on the quest and later went with Balin and Oin to try and retake Moria. Which they were able to occupy it for a few years and then all three were killed in an attack on Moria.
Oin was one of the thirteen dwarves to go on Thorin’s quest. He was of Durin’s line. His brother was Gloin. He was also the cousin to Balin. From everything I’ve learned about the dwarves that went on the quest were all related to each other in some way. But that is something to discuss at a later date. 🙂
Look forward to reading your comments. 🙂
Diane Riggins 
Well met!
These are two of the dwarfs I know the least about, and I know more than is good for me about Tolkien! 🙂
Hopped over here from the A to Z Challenge!
Hi Diana, thanks for stopping by. I know what you mean. Know little about some of the characters and too much about others. 🙂
It’s so sad when gimli finds out what happens. Every time you mention it, the scene when they find the book pops into my head.
Yes, it is. I feel so bad for Gimli when he finds out. That scene and others kept popping into my head while I was getting my topics for each letter together.