Washu's Family
Believe it or not, one way or another Washu is pretty much related to every character on Tenchi Muyo. How is Washu related to them? Well I'll tell you: Washu is related to every Juraian because Washu's sister, Tsunami, is the mother of all the spacetrees, the Juraian ancestors. That covers everyone except Ryoko and Mihoshi (I don't believe she's related to Kiyone). Ryoko is Washu's creation, thus her "daughter". Mihoshi is said to be Washu's great grand-daughter, because Mihoshi's grandfather, the Marshall at Galaxy Police, is actually Washu's son. Weither that's true or not many don't know. Washu's husband's name also remains unknown, and Washu has two sisters, Tsunami and Tokimi.

Washu's Origin
Washu was somewhat of a goddess 20,000 years ago, where she was immortal and free spirited. When Washu became mortal, her memory and most of her goddess powers were sealed in three gems, which Ryoko now uses as the sorce of her power. Washu's sister Tsunami has since then also become mortal, and is now in the body of Sasami to save her life from an attack on Jurai that took place hundreds of years ago. Kagato was one of Washu's students, and helped her create Ryoko, and because of her resembelance to Kagato, some think Ryoko might have some of Kagato's cells as well as Washu's, possibly making Kagato Ryoko's father. Because of Kagato's greed, he sealed Washu in a crystal in the reverse demention of the Souja, Kagato's ship, so he could have tottal control over Ryoko. For 500 years Washu was trapped in the Souja until the bubble-headed Mihoshi accedently set her free. Since then Washu has lived with everyone else in Tenchi's house.