Do I have to steal a key or something I keep getting locked in the house. Please tell me how to do this.

http://www.uesp.net/wiki/Oblivion:The_Sirens_Deception

There should be a key on Faustina after you kill her.

No key. After you kill the gang, Maelona and Gogan should appear and unlock the front door.

This is a known bug with this quest. I had it on my very first playthrough and I had to reload an earlier save game to fix it.

I was reading on the UESP about this quest, and it says you can kill the two guards in the farmhouse (assuming they ever show up), and they will still be alive in the town. Like they're clones or something. How weird is that?

Also in the bugs section, it doesn't list the guards not showing up as a known bug. Someone should fix that.

One topic is enough thanks.

http://www.gamesas.com/bgsforums/index.php?showtopic=1080178