they hate each other and bellatrix is a tratior to the blacks so she killed him -------------------------------------------------------------------------------------------------- You have terrible grammer. First off it should be 'Why are Bellatrix and Sirius fighting?' and they are fighting because they hate each other and are in a war.
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Sirius Black was murdered by his cousin, Bellatrix Lestrange, because she is the crazy, murderous type. He wasn't on Voldemort's side and Bellatrix was one of Voldemort's loyal servants.
It is never stated,it is unknown whether she even attended Hogwarts.
Sirius was part of a pure-blood family, and all pure-bloods are related in some way. Some of his cousins are Andromeda Tonks (Tonks' mother), Bellatrix Lestrange, and Narcissa Malfoy (Draco's mom).
Yes, Bellatrix is Draco's aunt. His mother, Narcissa, is her sister. Narcissa and Bellatrix (along with their other sister Andromeda) are part of the Black family and were Sirius Black's first cousins.
Yes in some way, although we are not sure of the exact relation. Dorea Black (1920 - 1977) married Charlus Potter and together they had one son. These could be Harry Potter's grandparents although it is unlikely since J.K. Rowling did state that James Potter's parents were older when they had him and Dorea would only have been 40 when James was born. Dorea was Bellatrix Lestrange's great aunt. So Harry and Bellatrix could be second cousins but are most likely more distantly related.