I forget. Is Oberon the one who's selling the Airship items?
Or is that Shandalar? The women are his daughters and you don't have to kill them - just steal the items. If you have ToSC you meat shandalar in Ulgoth's Beard where he is either angry at you (well, you may have killed his daughters
http://www.gamebanshee.com/ubb/wink.gif) or asks you nicely to go on a quest
http://www.gamebanshee.com/ubb/smile.gif