i can post the back story from the seven sisters source book, if i know that i wont be flamed for copyright infringement. basicly, from the elminster: the making of a mage novel, elminster, as a lad, had an avater of Mystra as a romantic companion. when she revealed herself to him, she offered to make him one of her chossen. magic is now very much a part of his being. he doesnt need sleep, food, adn other mundane troubles.
this was done because, some say, mystra, having her power rooted in the magic of the land, forsaw the time of troubles and wanted to give some of her power over to some mortals, to ease that troubled period. anyway, most mortals were found to not be able to wishstand the divine power, adn died, or became twisted and corrupt, like the mage who founded the cult of the dragon.
so instead of trying to force power upon mature hosts, mystra set about breeding suitable vessels. but doing so, she also hoped to avaoid the fueds and ties most adults would bring with them. thats where the seven sisters come in. they are the mortal offspring of mystra, so co-habbited the body of a young half elven mage, adn together with a noble young harper, they produced six fine young girls. however, the harper, Dornal, wanted a son, and was distressed by the state his wife had become. the co-habbitation of mystra had left her body a wreck, almost like a lich, teld together only through mystras will. he had a preist try to help her, but the preist informed him that another power had corrupted her (mystra, but he did not know this) in a rage, he beheaded his once lovly wife. this cause mystra to reveil herself. dornal felt used, adn left mystra, cursing he. but mystra was left with a problem, what to do with the seven, unborn infant? the body of a goddess in unsuitable for child birth, adn her powers would fry the child in its womb.
long story short, some outcast drow were nearby, havin eft the underdark for not bowing to lloth. one of them had a still born child in her womb. to prevent the poisioning of the drow mother, with her grace, mystra switched babies in the womb. the seven sister was born a drow.
there is a whole lots more information about the sisters in tyhe source book, but thats the basic background. the sisters are
1.Syluné,
2.Alustriel,
3.Dove Falconhand
4.Laeral Silverhand
5.the simbul
6.Storm Silverhand
7.Qilué Veladorn
Syluné has pasted away, defending her home of shadowdale from an attack by and anciet red dragon. she was killed when she broke her staff of the magi over her knee, relashing all its powers at once.
Alustriel is the lady of silverymoon, and has brought that city to a level almost rivaling myth drangor in its wealth of tolerance and knowledge
Dove Falconhand is one of the members of the knights of myth dranor
Laeral Silverhand is the consort of Khelben blackstaff, a (possible) secret lord of waterdeep.
the simbul is also known as the witch queen of Aglarond. she is rumored to be a secret lover of elminster (now theres an image for you!)
Storm Silverhand is a leading member of the harpers, adn possibly the best known of the seven sisters. she lives in semi retirment in shadowdale
not much is known about the seventh sister, Qilué Veladorn, altho it is known that she worships both mystra, and Eilistraee, one of the few gods of good drow. she is, infact, a high preistest of Eilistraee.
okay, hope that answers most peoples questions. anything else people would like to know about the forgotten realms, i'll do my best to answer.