Fun fact: Molly Weasley's iconic line "NOT MY DAUGHTER, YOU BITCH!" is not the first time the word bitch is used. He changed course, running at Bellatrix rather than Voldemort, but before he had gone a few steps he was knocked sideways. "NOT MY DAUGHTER, YOU BITCH!"
During the duel, Bellatrix shot a Killing Curse at Ginny. Bellatrix's curse narrowly missed Ginny, sparing her death by mere inches. Molly Weasley witnessed this and, enraged at the Death Eater, ran towards her, shouting "Not my daughter, you bitch!".
In the final movie, Harry Potter and the Deathly Hallows pt. 2, Molly first hits Bella with a spell that freezes her, most likely Petrificus Totalus. Then, she launches another one that shatters her entire body into pieces, which could be expelliarmus, bombarda, stupefy, or any spell that can produce such an effect.
The author explicitly states that both women were fighting to kill, despite Molly refraining from casting the Unforgivable curse Avada Kedavra. The result of the duel actually comes about as a result of nothing more than spectacular accuracy on Weasley's part.
What Spell Did Molly Use to Kill Bellatrix SOLVED! | Harry Potter Film Theory
Is Molly stronger than Bellatrix?
Molly's ability to cast non-verbal spells demonstrated her mastery of magic. Molly's love for her family and her determination to protect them gave her the strength to defeat Bellatrix Lestrange in a duel.
In the play "Harry Potter and the Cursed Child," which has become part of "Harry Potter" canon, it was revealed that Bellatrix conceived a child with none other than Lord Voldemort.
Bellatrix greatly underestimated Molly. Bellatrix was the better fighter but Molly is much stronger than she looks. Molly had more to fight for and a better reason to fight harder.
In Harry's case, neither Molly or Arthur ever explicitly tell Harry he can call them by their Christian names, so he continues to use Mr. and Mrs. I don't think they would have minded at all, but it's convention and he's a polite boy.
During the final battle, Bellatrix was the last Death Eater standing. She was eventually killed in a duel by Molly Weasley after her attempted murder of Ginny Weasley. Before her death, Bellatrix secretly gave birth to an illegitimate daughter named Delphini, whom she conceived with her beloved master, Lord Voldemort.
Simple answer is, that's only in the movies. They often play fast and loose with things that might look or sound cool in the moment but make no sense in the overarching story. Ron never casts Avada Kedavra at Nagini in the books.
In Order of the Phoenix, Bellatrix kills her first cousin Sirius, only to later be killed by Molly Weasley (Bellatrix's second cousin once removed by marriage). In addition, Lucius Malfoy and Arthur Weasley have a well-established feud despite being second cousins once removed by marriage.
When Arthur arrived home from work, he made her ask him their security questions before allowing himself in, as to set an example and in the process revealed that Arthur's private nickname for her was "Mollywobbles."
It is assumed Bellatrix was at least initially drawn to Lord Voldemort because they both believe in an ideology that favors pure-blood wizards and witches over other members of the community. This elitism, shared by the Malfoy and Lestrange clans, was instilled in Bellatrix since childhood.
Ginny was the first female in the family for a long time. Molly does not really have favorites. She loves all her family equally, and you can see that in Order of the Phoenix where she tries to get rid of a Boggart, but it keeps changing into the people that she loves: her husband, Percy, Fred, George, Ron, Harry…
Molly Weasley was quick to accept Harry into her family. He had been half-starved for 12 years before he set foot into the Burrow, and Ron's mother was determined to remedy this by filling him with as much home-cooked food as possible. From there, Molly continued to treat Harry as one of her own.
Her children, even the adult ones, often feel exasperated by her hovering, causing some of them to avoid her when possible. Since Molly loves Harry like a son as well, this smothering tendency extends to him.
In an interview with Entertainment Weekly, Helena Bonham Carter spoke about Bellatrix Lestrange's Pure Evil status, noting that she is a very sick sadist and racist with problems who, despite serving so long in prison, most likely already was troubled beforehand.
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.
This curse (incantation unknown) was used by Molly Weasley in the skirmish at the Great Hall which was part of the Battle of Hogwarts. The exact effects of this spell are unknown, but when used with enough force, it was capable of killing the target.
Lord Voldemort had no wife he and Bellatrix just made a baby together. Voldemort couldn't love anyone. But the girl mother (In cursed child) is Bellatrix Leatrange.
She was raised by Euphemia Rowle then Rodolphus Lestrange. It would not be very surprising if they told her everything about Voldemort, his greatness, his power, his ambitions… since he was their master.
He felt nothing for his family, and only wanted his friends in school to rally around him because he wanted to hold power over them. Bellatrix Lestrange was obviously in love with him and worshiped him, but he only cared for her servitude, not her. We know that he did not date anyone, even when at Hogwarts.
