This quest should only be done if you are level 25 (for the best effects).
First go to The Grey Mare in Chorrol and speak to the drunk at the right side of the building. He will tell you to find his brother in Cheydinhal. He is upstairs at Newland's Lodge at the west side of town.
Fast travel to Chorrol and if you have a horse you will need to wait for him to reach town since he goes running. Talk to him and he will thank you and such.
Speak to him again and he will send you on a journey to find his long lost home that was overrun by ogres. Follow the quest line and kill the ogres. Go back to him and you'll be rewarded.
That is not the last of the Jemaime brothers though. Wait 2 days the go to Oak and Crossier.
Speak to Fathis Ulen the thieves guilds best fence. He will tell you of a story involving the brothers, it just so happens that their father was a thieves guild member.
YadaYada just follow the quest line and steal the sword back from the ogres.
You have 2 choices. Take the sword to Fathis Ulen for like 3500 gold, or take it to the castle for the best shield in the game. Escucheun of Chorrol (35% reflect damage and 10 endurance)!