No, because Sana Khan doesn't has any brothers or sisters.
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Kodocha is about a hyper-active girl called Sana. The main characters are Sana and Akito. Sana is a adopted-child and Akito gets abused by his sister for being born (because his mother died giving birth to him). He causes trouble the classroom and makes fun of the girls and the teachers with the boys. Sana saves the day and makes Akito's live at home much more comfortable. Sana is a idol who is seen in commericals, dramas and all sorts of things. She's a girl who has a lot of talent and trouble with maths, she's a cheerful girl who'll brighten everyone's hearts! It's a story about School, Family and Love with a lot of comedy in it. By the way, they kissed three times! For more info, watch it yourself. It's a 102 episode anime.
No. Fuuka lets him go to Sana. It was Fuuka who dumped him.
In episode 101,102
Sana Sota Susi Sika
Episode 37 Karate and Trumpet Compete for a Kiss.