Niece of producer Dr. Lakhan Sinha.
Niece of Pahlaj Nihalani ( Mother's cousin).
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).