- When the media commented on her resemblance to her father's former co-star Reena Roy, she and Reena have stated that there is no resemblance and that Sonakshi looks like her mother Poonam Sinha.
- Sister of Luv and Kush Sinha.
- Cousin of actress Bhavna and Pooja Ruparel ( Their maternal grandmothers are sister's).
- She was born while Shatrughan Sinha was shooting for Maha Yatra with a full on beard.
- Cousin Preeta Sinha is Co-founder at One Green Planet in New York, She is the daughter of Lakhan Sinha.
- Niece of director Loksen Lalvani. Loksen is married to Sonakshi's mother's sister.
- Niece of producer Dr. Lakhan Sinha.
- Niece of Pahlaj Nihalani ( Mother's cousin).
- In 2001,brother Kussh Sinha had enrolled himself in dance classes as he was preparing to be a actor. He was also working out with Sohail Khan. He later dropped all plans.
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