As the oldest of the girls, she is expected to act as "housewife" of the group, including acting as caretaker of the two youngest kids in the group.

AD. 2058, on the Clayad which was the 3rd planet of the Ypserlon system, which was 43 light years away from Earth, suddently aliens raided the planet.The emigrants on the Clayad had to escape from the planet. Because of the confusion during the escape, the children were strayed from their parents and got in the training space ship, Janous. With a lot of sacrifices, they managed to arrive at 4th planet Belwick. However, the Belwick had been already in the war. Therefore, the 13 children had to go to the Earth by themselves. 
(Source: AnimeNfo)

Her true name is Yoshiko Masumoto (増本美子) and her maiden name is Tominaga (冨永).  She works for mint Avenue.

[Blog](http://ameblo.jp/tominaga-miina/)

On July 27 1996, Mr. Takeyuki Kanda died suddenly at the age of 52. Born August 11 1943, he was known as the director of several animations including VIFAM. Thus in 1998 a new TV series of VIFAM was broadcasted in memory of him. Televised 1998/3/21-1998/10/3 (in Kansai area), it contains 26 episodes, and like Twelve people disappeared it is a sidestory, but some new features are added: new persons, new RV, etc. 
The story could be inserted between #22 and #26 (#24 and #25 are digests) of VIFAM, and is divided into three parts: Act I (#1-14), Interlude (#15-18), Act II (#19-26), if we name them (in reality Act I and II have little relationship). It could also be the New Testament, but it is now regarded as an apocrypha (or worse, a pseudo-VIFAM). There are several reasons to say so, but to watch the story is the best way to understand them. 
(Source: u-netsurf.ne.jp/~suemura/vifam/vguide.html)

Clare Barbland