Niece of producer Dr. Lakhan Sinha.
Sister of Luv and Kush Sinha.
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.
Cousin of actress Bhavna and Pooja Ruparel ( Their maternal grandmothers are sister's).
Niece of Pahlaj Nihalani ( Mother's cousin).