On a rare occasion, non-magical parents (muggles) can produce magical offspring, called muggle-borns. In even rarer cases, some magical parents could have children incapable of magic, known as squibs. Squibs can interact with the magical world, which implies that they have slightly more magical ability than muggles.
Witches and wizards with non-magical parents are called Muggle-borns. There have also been some children known to have been born to one magical and one non-magical parent.
Magic passes through genes. Sometimes, it is latent in some people, and they thus become squibs. Squibs are usually married off to muggles. Their progeny will have, however latent, magical genes in them, and perhaps after a few generations, will result in magical children, despite their parents being muggles.
Mudbloods: Wizards can be born from non-magical parents because these mutations can pop up out of nowhere. There's a better chance of you being magical if your parents are on the high side of the normal range. Squibs: Would be the offspring that are born to magical parents but don't inherit the dominant wizarding gene.
Muggle-born
Rowling has stated they are the second-most common of the three blood statuses of wizards, numbering about 25 per cent of the wizarding community. They are often believed to be descended from Squibs who married Muggles, and the dormant magical gene may resurface after a couple of generations.
James Potter was a pure-blood wizard born to Fleamont and Euphemia Potter, two affluent people. He was sorted into Gryffindor House at Hogwarts School of Witchcraft and Wizardry, where he studied. He rapidly gained notoriety for his Quidditch prowess and mischievous ways.
The Weasleys
' We finish on a family who are technically quite pure-blood, but are deemed 'blood traitors' by various peers, and seem proud of it. It is, indeed, the Weasleys' compassion and morals that led to several members marrying half-bloods, Muggle-borns, etc.
Mr and Mrs Granger – we're never told their first names – were introduced to the wizarding world in much the same way that most Muggles are: they received a letter from Hogwarts, which revealed their daughter to be a Muggle-born witch. According to Hermione, the news came as a surprise, but her parents were supportive.
Yes, although we haven't met any in the seven Harry Potter novels. The Pottermore introduction to Slytherin says: […] we have traditionally tended to take students who come from long lines of witches and wizards, but nowadays you'll find plenty of people in Slytherin house who have at least one Muggle parent.
If a Muggle were to look at Hogwarts, for example, all they would see is a ruin with signs telling them to keep out. Some magical locations are sequestered entirely from the Muggle world – with Diagon Alley, in particular, being accessible through a number of gateways between the two worlds.
Harry James Potter holds half-blood status in Rowling's imagined wizarding world because his mother is Muggle-born and his father is pure-blood. There are three main blood statuses; pure-blood, half-blood, and Muggle-born, which are all methods of determining a witch or wizard's magical lineage.
The fan asked the author if Aunt Petunia was a Squib (a non-magical person who is born to at least one magical parent) and Rowling replied: "Good question. No, she is not, she is not a Squib. She is a Muggle.
Though nominally a Muggle-born witch, Hermione is descended from the Dagworth-Granger family through her father's squib heritage.
Just like his father, Draco loved to hate on Muggles. He took particular pleasure in taunting Hermione Granger, who just happened to have Muggle parents. Malfoy called her 'Mudblood', a very grave insult referring to a wizard or witch born to non-magic parents.
Diagon Alley is a high street located in London. It is accessible to the wizarding world, to which it is something of an economic hub, but hidden from Muggles (non-magical people). However, Muggles are allowed access to it if they need to accompany their Muggle-born magical children.
While Muggles cannot see Dementors, their draining power is so strong that non-magical people can still sense them.
In the Chamber itself, we see a large statue of a wizard, which Harry presumes is Salazar Slytherin. We also meet Tom Riddle, who is, as it turns out, the heir of Slytherin. Present only in spirit, he has all the same been controlling Ginny, and having her act as Slytherin's heir.
The Heir of Slytherin turns out to be Ginny Weasley, who is being controlled via a magical diary that once belonged to Tom Riddle, AKA Voldemort.
Her real parents were Daneel and Dean Novak, Pureblooded wizards. Turns out Daneel was Tom Riddles younger sister, Daneel Riddle. Of course, the Riddles were related to Salzar Slytherin himself, and this made Hermione the living heir of Slytherin. The problem with being a female Slytherin heir, is that they're cursed.
And this is why Hermione does not fit into Ravenclaw, since she lacks their creativity of thought. When you also add in her fearlessness and her strong convictions about right and wrong, which are inherently Gryffindor traits, then there was even less of a chance she'd end up wearing blue and bronze.
The explanation is very simple - Harry has a very strong sexual desire for Ginny. He has no such feelings for Hermione. Sex is a fundamental aspect of adult relations. Sex is, in fact, the characteristic that defines the difference between a platonic relationship and a romantic one.
Hermione also knew that her parents, and anyone else she associated with, would be in serious danger because of her friendship with Harry. And so, she chose to erase herself from her parents' minds. Hermione wanted to keep her parents safe from Voldemort by ensuring he had no reason to come knocking.
One of the wealthiest Wizarding families in Britain, the Malfoys were known for their connections to other pureblood families and their covert influence over the magical government. In contrast to the Weasleys, the Malfoys were traditionally sorted into Slytherin and supported pureblood supremacy.
Having rendered unknown, shady, (and almost certainly magical) services to King William I, Malfoy was given a prime piece of land in Wiltshire, seized from local landowners, upon which his descendants have lived for ten consecutive centuries.
Luna Lovegood is a Pureblood witch, who was sorted into Gryffindor House during Harry Potter's second year at Hogwarts School of Witchcraft & Wizardry.