Tenchi is Mayuka's father. He
is the only family that she knows. She really loves him, and hangs
all over him. But he only thinks of her as another girl. He
doesn't think that she's his daughter for obvious reasons as she's about
the same age as him, and he doesn't really know who her Mother would
be. Tenchi really cares about Mayuka, even though he's shocked
from her thinking that he's her father.
Yuzuha is Mayuka's Mother.
She is a demon from another realm. She created Mayuka from her and
Tenchi's hair. Mayuka doesn't really know her mother till the end
when she realizes why she's there. Yuzuha sent Mayuka to bring
Tenchi to her. She wanted Tenchi dead. She doesn't care for
Mayuka, and punishes her whenever she disobeyed her. She only
thinks of her as just a human cast, a lifeless doll. Sadly, she
was the one who killed her.
Yosho is Mayuka's Great
Grandfather. He figures out that she came to get Tenchi before
anybody else, but knows that she doesn't know why she's there. He
treats her like a grandchild.