A man opened fire on his sister and brother-in-law for marrying of their own free will in the city’s Pehalwan goth, police said on Monday. According to details, a man named Safdar was killed in a shooting in the Pehalwan Goth, Gulistan-e-Jauhar, Karachi while his wife Azra was critically wounded.The police said Safdar, who is a waiter at a hotel and his wife Azra, were invited by the family of Azra.