Four or five years ago, in a novel, the protagonist's mother was a dual-element magician, and his father was a sword saint. It seemed that the protagonist also had a Xuanyuan sword.

My Knowledge has a deadline and cannot provide the content of novels from four or five years ago. However, I can recommend a novel that is similar to the plot you described. It is called Battle Through the Heavens. This was a very popular fantasy novel. It told the story of a young boy, Xiao Yan, who rose to power during his training. His mother was a powerful mage, and his father was a powerful sword saint. He also had a mysterious Xuanyuan Sword. I hope you will like this novel.