Question: Who is the sibling of the author of Kapalkundala?

Knowledge 1: Kapalkundala
Kapalkundala (), also known as Mrinmoyee, is a Bengali romance novel by Indian writer Bankim Chandra Chattopadhyay. Published in 1866, it is a story of a forest-dwelling girl named Kapalkundala, who fell in love and got married to Nabakumar, a young gentleman from Saptagram, but eventually found that she is unable to adjust herself with the city life. Following the success of Chattopadhyay’s first novel "Durgeshnandini", he decided to write about a girl who is brought up in a remote forest by a Kapalika (Tantrik sage) and never saw anyone but her foster-father. The story is set in Dariapur, Contai in modern-day Purba Medinipur district, Paschimbanga (West Bengal) where Chattopadhyay served as a Deputy Magistrate and Deputy Collector. [SEP] Knowledge 2: Sanjib Chandra Chattopadhyay
Sanjib Chandra was born to an orthodox Brahmin family at Kanthalpara, North 24 Parganas. He was educated at Hooghly Mohsin College founded by Bengali philanthropist Muhammad Mohsin and Presidency College, Calcutta. He was one of the first graduates of the University of Calcutta.
Knowledge 1: Kapalkundala
Kapalkundala (), also known as Mrinmoyee, is a Bengali romance novel by Indian writer Bankim Chandra Chattopadhyay. Published in 1866, it is a story of a forest-dwelling girl named Kapalkundala, who fell in love and got married to Nabakumar, a young gentleman from Saptagram, but eventually found that she is unable to adjust herself with the city life. Following the success of Chattopadhyay’s first novel "Durgeshnandini", he decided to write about a girl who is brought up in a remote forest by a Kapalika (Tantrik sage) and never saw anyone but her foster-father. The story is set in Dariapur, Contai in modern-day Purba Medinipur district, Paschimbanga (West Bengal) where Chattopadhyay served as a Deputy Magistrate and Deputy Collector. [SEP] Knowledge 2: Elizabeth II
Elizabeth's only sibling, Princess Margaret, was born in 1930. The two princesses were educated at home under the supervision of their mother and their governess, Marion Crawford. Lessons concentrated on history, language, literature and music. Crawford published a biography of Elizabeth and Margaret's childhood years entitled The Little Princesses in 1950, much to the dismay of the royal family. The book describes Elizabeth's love of horses and dogs, her orderliness, and her attitude of responsibility. Others echoed such observations: Winston Churchill described Elizabeth when she was two as "a character. She has an air of authority and reflectiveness astonishing in an infant." Her cousin Margaret Rhodes described her as "a jolly little girl, but fundamentally sensible and well-behaved".
Knowledge 1: Kapalkundala
Kapalkundala (), also known as Mrinmoyee, is a Bengali romance novel by Indian writer Bankim Chandra Chattopadhyay. Published in 1866, it is a story of a forest-dwelling girl named Kapalkundala, who fell in love and got married to Nabakumar, a young gentleman from Saptagram, but eventually found that she is unable to adjust herself with the city life. Following the success of Chattopadhyay’s first novel "Durgeshnandini", he decided to write about a girl who is brought up in a remote forest by a Kapalika (Tantrik sage) and never saw anyone but her foster-father. The story is set in Dariapur, Contai in modern-day Purba Medinipur district, Paschimbanga (West Bengal) where Chattopadhyay served as a Deputy Magistrate and Deputy Collector. [SEP] Knowledge 2: Kirka
Several Babitzin siblings are established musicians in their own right. In 1978, Kirka released a duet album with sister Anna; the next year, another sister Marija ("Muska") joined in.

Answer: Sanjib Chandra