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.
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Harry Potter has 2 sons; James Sirius Potter and Albus Severus Potter
Sirius Black.
Harry Potter's father is James Potter and Arthur Weasley is his father-in-law. He was raised by his mothers sister and her husband, Petunia and Vernon and Aunt Petunia Dursley His godfather was Sirius Black.
Ginny had one daughter with Harry named Lily Luna Potter after Harry's mum and Luna Lovegood.
Mcgonagle, James potter, Sirius Black, Peter Pettigrew, And the rest are in the third book (Harry potter and the prsoner of azkaban)