SHAHKOT- A man killed his elder brother and sister-in-law on Friday over a minor dispute Ghulam Mustafa had dispute with his younger brother Dilshad over his daughters proposal. Dilshad opened indiscriminate firing on his brother and sister-in-law. As a result, Ghulam Mustafa and his wife Najma Yasmeen died at the spot. Police have registered a case against accused Dilshad and started investigations.