"I know what you're looking for. . .better than you do".
Full 3.5 edition statistics for Kalaash can be found in the Dragonmarked source book on page 81.
His relationship with Kava Velderan is never mentioned though, she is a heir to House Tharashk and a inquisitive in Sharn. Neither has the question as to why he would create his own independent inquisitive service when Kava already runs the largest service in Sharn.