Tom Riddle killed his father because he thought muggles were filth and wanted to avenge his mother by killing his father and his father's parents (his grandparents, who were also muggles)
Also because his father abandoned his mother.
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He killed his fathe, alright. The incident isn't shown in the film. The film had highly restricted memories.
He killed Harry's mother and father. This was due to a prophecy that he came by that told of a boy that would be born and would eventually be his downfall (Harry).
His birth name was Tom Marvolo Riddle. He hated his name, because his father was a muggle. However, he made Lord Voldemort out of Tom Marvolo Riddle. If you rearrange the letters Tom Marvolo Riddle can say "I am Lord Voldemort." You see him demonstrate this in HP and the Chamber of Secrets.
He didn't exactly spare him; he tried to kill him but failed.
Tom's mother was Merope Gaunt who was a squib. Her father was Marvolo Gaunt, who was the namesake of Tom's middle name. They were decsendents of Salazar Slytherin and Merope was disowned for using a love potion to make a muggle, Tom Riddle fall in love with her. Right after she had Tom jr. she ran out of love potion and Tom sr. left her.
It depends on how many one wizard or witch has. for example, Lord Voldemort had six and a seventh one he never meant to make which was Harry Potter. to be able to have a horcrux that person will have to murder others which will cause their soul to split. like Lord Voldemort, he split his soul into seven pieces. in the harry potter films, one by one they were destroyed. if a horcrux gets destroyed that witch or wizard will feel pain or die if only spliting their souls once. but Lord Voldemort as known as Tom Marvolo Riddle, was obsessed with not dying even at an early age causing him to create so many.
Harry kills Voldemort Voldemort Kills Snape Voldemort kill Robert pattison Snape kills Dumbledore someone kill Barty Crouch Deth eaters kill Fred weasley Deth Eaters kill tonks deth Eaters kill lupin Death eaters kill moody ...the death eaters kill a few,don't they?