"मैं तुम्हारी बहन हूँ।"
Translation:I am your sister.
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Tum/tumhari isn't formal; from what I've been taught, it's used in casual or friendly situations. Aap (and what derives from it) is the more formal, respectful pronoun. Tu is something you'd only use for people extremely close to you, like younger family members or boyfriend/girlfriend. It could be rude if you misuse it.