Though Merope did fall in love with, and (it is implied) eventually marry, Tom Riddle, the child she had with him seems to have developed into someone who hated Muggles as much as Merope's father and brother.
As surmised by Dumbledore, once Merope was alone and no longer dominated by her father, she could make her move for Tom. She offered him a drink laced with a love potion, and he became infatuated with her; they soon eloped and, within three months of the marriage, Merope became pregnant.
Voldemort's story began when Merope Gaunt married Tom Riddle, and they had a son, Tom Marvolo Riddle who would become Voldemort.
Delphini (b. March 1998), known by the nickname Delphi, was a British half-blood Dark witch, the daughter of Tom Riddle and Bellatrix Lestrange. Being the only child of Lord Voldemort, she was able to speak Parseltongue, and she became the only known living heir of Salazar Slytherin after the demise of her father.
She had a child with Voldemort
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.
This may have even influenced him to get Delphi with Bellatrix Lestrange. If Delphi had not been born, Salazar Slytherin's line would have perished with Voldemort. As things stand with The Cursed Child, Delphi is now the last surviving heir of Slytherin.
By the time he was Lord Voldemort (despite what I said earlier about the graveyard scene), Tom Riddle had become fully and completely asexual.
Emily Riddle, later known as Lady Voldemort or, alternatively as You-Know-Who, She-Who-Must-Not-Be-Named, or the Dark Lady, is a half-blood witch who is considered to be the most powerful and dangerous Dark Wizard of all time.
Voldemort also “was unable and unwilling to express remorse or empathy for the countless crimes he had committed” (wiki). It is astonishingly evident that Voldemort has an antisocial personality disorder.
May 29, 1993: Harry Potter stabs a basilisk fang into Tom Riddle's diary inside the Chamber of Secrets—unknowingly destroying his first Horcrux.
Delphi was conceived from a liaison between Voldemort and Bellatrix. She was born at Malfoy Manor, shortly before the 1998 Battle of Hogwarts. As Bellatrix and Voldemort were both killed in the Battle and Bellatrix's husband Rodolphus was imprisoned at Azkaban, Delphi was raised by Euphemia Rowle, a Death Eater.
This theory suggests that each time he created a new Horcrux, that specific Horcrux diminished a part of his soul. Thus, his nose began to sink in, eventually disappearing altogether. Due to his tampering with dark magic, his human appearance evolved into a more snake-like state.
Dumbledore did not hate Tom Riddle. He merely warned him not to use magic to hurt others, but he allowed Riddle to have a clean slate at Hogwarts. He pitied Riddle and wanted to give him a second chance. Nevertheless, he never liked him either.
Dumbledore always treated Tom decently. He did not even dislike him in the strict sense. He was just concerned and cautious considering that Tom had hurt children and taken trophies.
Voldemort's given name was Tom Marvolo Riddle. In the second book he explains that the appellation "Lord Voldemort" is derived from an anagram of his name: TOM MARVOLO RIDDLE → I AM LORD VOLDEMORT. This is also a play on words, as his name, Tom Marvolo Riddle, is also itself a riddle.
Riddle was educated at Hogwarts from 1938 to 1945, and was sorted into Slytherin House, a nod to his ancestor Salazar Slytherin. During summer breaks, he was forced to return to the Muggle orphanage, which he despised and dreaded more than any other place on earth.
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.
Raised in an orphanage, Tom began attending Hogwarts in 1938, where he was sorted into Slytherin and presumed to be Muggle-born.
Tom's feelings about his father are very straightforward – pure hatred and uncomplicated loathing. He intentionally destroys and discards his father's name and facial features like a snake shedding its skin.
As Rowling explained in a series of tweets, Snape loved Harry's mother, Lily, and his unrequited affection drove him to resent Harry's father, James — and by extension, Harry himself.
She marries Rodolphus Lestrange and according to the Cursed Child play, has a child with Voldemort named Delphini. She was killed by Molly Weasley by an unknown spell.
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.
Delphini's birth was one of the most well-guarded secrets of Voldemort and his servants. She was sent to live with Euphemia Rowle, who only raised her because she was offered gold, though we don't know who paid her.
Rowling said in an interview that Dumbledore was about 150 years old. However, on her website, she states that Dumbledore was born in 1881, making him either 115 or 116 at the time of his death.