The character's name is Sirius Black and he didn't have a sister. He did have a brother named Regulus, though. Bellatrix Lestrange, Andromeda Tonks, and Narcissa Malfoy were his cousins, but not his sisters.
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Sirius Black.
The Dursley family. Mrs Dursley was the sister of Harry Potter's mother.
Petunia Dursley is the sister of Lily Potter, Harry's mother. This makes her Harry's aunt. Vernon is her husband Harry's uncle, and Dudley is their son, his first cousin.
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.
Nobody in Harry Potter is called Jenny. You probably thinking about Ginny Weasley who is Ron Weasley's only sister and the youngest Weasley child. She is married to Harry Potter and has three children with him.