Voldemort (Tom Riddle) does not have a sister; he was the only child of Merope Gaunt and Tom Riddle Sr., but he did have a daughter, Delphini, with his most devoted follower, Bellatrix Lestrange, born in secret after his apparent defeat. He had no biological siblings, though his mother was from the pure-blood Gaunt family, and his father was a Muggle.
Voldemort doesn't have a brother. But Snape is loyal to both Voldemort and Dumbledore.
Bellatrix is a member of the Black Family and is the cousin of Sirius Black. Bellatrix is the daughter of Cygnus and Druella Black and sister to Andromeda (mother of Nymphadora Tonks) and Narcissa (mother of Draco Malfoy).
Delphini is the child of Lord Voldemort and Bellatrix Lestrange. She was born in secret at Malfoy Manor in 1998.
But despite Bellatrix being a Lestrange by marriage (her husband Rodolphus and her brother-in-law Rabastan may or may not be Leta's descendants for that matter), Sirius Black has previously mentioned that "the pure-blood families are all interrelated", meaning there is a possibility of at least a Black-Lestrange (and/ ...
There are plenty of Slytherins who have gone above and beyond – one that immediately springs to mind is Leta Lestrange. At the end of Crimes of Grindelwald, Leta realised that Newt and his brother Theseus were in peril and decided to rescue them.
Bellatrix Lestrange was clearly a villain. She was cruel, she was known to kill and torture, she followed Voldemort and truly believed in his odious vision of how the wizarding world should look. In short, Bellatrix was about as evil as they come and had no redeeming features.
In 1943, Tom Riddle, the "Heir of Slytherin", opened the Chamber of Secrets to conduct a purge on Muggle-born students. This resulted in the death of Myrtle Warren, who eventually returned as a ghost. Riddle opened the Chamber again in 1993 through the use of one of his seven Horcruxes, his diary.
Voldemort met Nagini, a Maledictus (a woman cursed to become a snake), during his exile in Albania after his first defeat, likely in the forests there, where she was already a massive snake. He found her while possessing snakes to survive, and their connection grew due to his Parseltongue ability and her unique ability to sustain him, eventually leading him to make her a Horcrux by killing Bertha Jorkins in 1994.
He trusted snape because snape had proven himself many times before. Voldemort took anyone that was magical and had his own ideas in common during his first crusade.
This may have been because of several reasons: the anti-werewolf legislation, his suspicions that his in-laws disapproved of his marriage to Tonks, or because of Tonks' pregnancy. Remus was extremely upset by the pregnancy.
While not directly stated in the main Harry Potter books, it's widely believed and theorized by fans that Luna Lovegood and Draco Malfoy are distant cousins, likely through Luna's mother, Pandora Lovegood (née Malfoy), making her Lucius Malfoy's sister and Draco's aunt, and thus Luna and Draco first cousins. This stems from the fact that nearly all wizarding families, especially purebloods, are interconnected, and Luna's blonde hair and family's eccentricity align with hints of Malfoy/Black ancestry.
Lestrange was the surname of an ancient pure-blood wizarding family, originally from France but also with branches in Great Britain, and one of the Sacred Twenty-Eight. They were related to the Rosier, Black, Malfoy, Tonks, and Lupin families.
Lily Evans was Petunia's only sibling. When Lily's magical abilities began to manifest themselves, Petunia was torn between curiosity and disapproval. Their relationship became even more strained when Lily became friends with Severus Snape, the very peculiar boy next door.
Hermione Granger became pregnant with her first child, Rose, after the Second Wizarding War, likely around 2005, and had her second child, Hugo, around 2007, both with Ron Weasley, after they settled down following the war, with Rose inheriting Ron's red hair and Hugo Hermione's brown hair.
The Riddle family was a very old Muggle family who had been established in the area around the Hangleton villages for quite some time. The family was very wealthy and owned much of the village of Little Hangleton, ruling over their lands from the handsome and large Riddle House.
Because some snakes could sense heat and movement in a way humans could not, Nagini was able to detect Harry and Hermione even when they were under the Cloak of Invisibility. Harry fought with Nagini, and the serpent bit him before coiling herself around Harry to hold him in place for Voldemort.
Until then, Voldemort required the potion every few hours to keep his crippled body alive, and Pettigrew had to continuously milk Nagini for the venom to keep feeding his master.
While Credence is a Dumbledore, he isn't the brother of Albus, Aberforth and Ariana. In fact, he's Aberforth's secret son! Aberforth met Credence's mother the same summer that Albus and Grindelwald met.
Harry is the heir of Gryffindor, although he had characteristics of both Slytherin (cleverness, resourcefulness, determination) and Gryffindor (bravery, honor, recklessness, chilvary). It is why Harry was able to claim the Sword of Gryffindor.
Considering that Pansy Parkinson was one of the Prefects selected for Slytherin and Snape was nominally in charge, I think it's safe to say that the Head Girl badge went to her.
Salazar Slytherin
For many years, all was well among the four founders. Yet when shrewd Salazar Slytherin, 'from fen', suggested that only those from magical families deserved to come to Hogwarts, his three friends stood against him. Salazar Slytherin left the school.
Fred participated in the Battle of Hogwarts (1998), defending the castle's passageways with his twin. While fighting alongside his brother, Percy, he was killed in an explosion caused by Death Eaters. His brother George named his son in honour of him.
The main LGBTQ+ character confirmed by J.K. Rowling is Albus Dumbledore, revealed to be gay and to have had a passionate, intense love relationship with the dark wizard Gellert Grindelwald in their youth, though this isn't explicitly detailed in the books but rather in later interviews and supplementary materials. While not canon, some fans also interpret other characters like Sirius Black, Remus Lupin, or even Harry Potter as queer, but Dumbledore and Grindelwald are the key confirmed figures.
However, there's no doubt that Professor McGonagall is the more capable duelist, and she would completely defeat Bellatrix Lestrange in a duel. It's important to remember the ongoing controversial statements by the creator of the Harry Potter franchise.