The Malfoys are related to the Black family through Narcissa (a first cousin of Sirius Black, Harry's godfather), which makes Draco a nephew of both Bellatrix Lestrange and Andromeda Tonks. Draco is also Nymphadora Tonks' first cousin through their mothers.
Now, on Dorea's side, there's the whole Black clan. Dorea was the great-aunt of Sirius and Regulus Black, as well as of Bellatrix, Andromeda, and Narcissa Black (later Narcissa Malfoy after marrying Lucius). Dorea would then be Draco's great-great-aunt, being the connecting link between Harry and Draco.
The female line of the House of Black, however, continues through Harry's children, James Sirius Potter, Albus Severus Potter and Lily Luna Potter, whose maternal great-grandmother is Cedrella Weasley née Black, also making Harry related to the House of Black via marriage.
Draco's mother is Narcissa Black, which makes Draco Sirius' second cousin. So once again we find this family tree getting just a bit more complex and twisted. Thankfully this is a connection that Harry failed to notice, at least to our knowledge.
Malfoy was the surname of a wealthy pure-blood wizarding family and one of the Sacred Twenty-Eight. They lived in Malfoy Manor in Wiltshire, England. The Malfoys were related to many other pure-blood families, including the Blacks, Lestranges, Greengrasses, and Rosiers.
Cedrella and Septimus had three sons, one of whom is Arthur Weasley. Through Cedrella, the Weasley family is related not only to the Black family, but also to the Crouch and Longbottom families. Through Arthur, she has seven grandchildren.
Are the Black Family related to Salazar Slytherin?
The Peverells, Gaunts, Blacks, Malfoys, Potters, Weasleys, Prewetts, and other families are all linked to one another through bloodlines and intermarriage. The only known direct descendants from Salazar Slytherin were the Gaunts, who for the most part shared their ancestor's beliefs in the purity of wizard blood.
Narcissa provided Voldemort with the information he needed to get Harry there after she gained it from Kreacher the House Elf, who gave it to her both because she was a Black by birth and because she treated the attention starved house elf more kindly than her cousin Sirius Black, the elf's current master, did.
Sirius had a younger brother, Regulus Arcturus Black, and three older cousins: Bellatrix Lestrange, Andromeda Tonks (his favourite cousin and mother of Nymphadora Tonks), and Narcissa Malfoy (mother of Draco Malfoy).
The Black family, one of the oldest and wealthiest wizarding families, prided themselves on their pureblood status and maintained prejudiced beliefs. Sirius Black, the black sheep of the family, defied his family's traditions and embraced friendship and kindness over arrogance and pride.
The pure-blood wizards and witches featured in the Harry Potter books are almost all supremacists, while there are some of them who do not advocate ancestral superiority; the Potters, Weasleys, and Longbottoms are old pure-blood families, but no known members of these families are sympathetic to supremacist aims.
Despite being a pure-blood, he didn't believe that he was superior to other witches, wizards and Muggles. He had a lot going for him and his well-placed morals were even more impressive if you think about the start that he had in life. Sirius came from a family of pure-blood fanatics.
All three members are related or blood related to the Weasleys, as Ron is a Weasley, Hermione married Ron making her a Weasley by marriage, and Harry married into the Weasley family through Ginny making him an in-law to the Weasley family, as well. The three are also related in some way to the Black family.
Based on what Cursed Child lays out, Voldemort would become Draco's uncle (pretending he had married Bellatrix), thus Scorpius' great-uncle, making Delphi be Scorpius' cousin-once-removed.
Harry Potter had a few love interests during his time at Hogwarts. Though he eventually settled down with Ginny Weasley, he also had a thing for Cho Chang in his earlier school years. Then, of course, there's his secret love for Draco Malfoy… Wait, what?
In the books, Pansy Parkinson has a schoolgirl crush on Draco, and they went together to the Yule Ball. However, there was no true love between them. In the Cursed Child, Draco Malfoy's wife is Astoria Greengrass.
Luna married fellow naturalist Rolf Scamander, grandson of Fantastic Beasts and Where to Find Them author Newt Scamander, considerably later in life than Harry, Ron, Hermione, and Ginny, who all married and started families in their early-to-mid twenties.
During this year, Narcissa became pregnant and miscarried. She was distraught and uncertain of what to tell Lucius, as she had not told him of her pregnancy. Shortly thereafter, he brought her out to the Leaky Cauldron to visit with his friends Vettlingar Yaxley and Thorfinn Rowle.
You had to act the part, but more importantly you had to look the part. They decided that they needed to see what I looked like with white hair. It meant the first of many bleaching that would become a staple in my life for the next ten years.
She married Rodolphus Lestrange after leaving Hogwarts "because it was expected of her" to marry a pure-blood. However, Rowling stated in an interview that Bellatrix truly loved Voldemort.
Also, James Potter was a pure-blood. One possible theory indicates that the author of the Directory considered the Potters and other "pure-blood" families (such as the Princes, the Crabbes, the Goyles, the Moodys, and the Browns) to have some amount of Muggle ancestry.
Ginevra Molly Weasley (also known as Ginny) is the youngest child and only daughter of the Weasley family. She is Sorted into Slytherin during Harry and Jim Potter's second year.
House Potter was excluded for their pro-Muggle stance in the Wizengamot. It is implied by Harry Potter that House Bones was left out for similair reasons.
