(The top two pics) These are Yuri’s parents. We don’t see much of them except for about four pages in the first volume of the manga. But it seems to us that they are nice middle class people and care very much for their children.
(The two pics on the right) The one with the glasses is Marie, who is Yuri’s older sister. The other one is Eimi, who is Yuri’s younger sister. The sisters all seem to get along just fine, and they treat each other like the best of friends. Their little talks about boys and Yuri’s first kiss were really cute. Anyway, these girls rule!