The protagonist was found in a cave by a couple and brought home. He even had a pet that looked like a fox. Was this a fantasy novel that he had read before?

The main character's father was a high-ranking warrior, and his grandfather was a prime minister. Later, the main character's father's teacher was a swordsman of the neighboring country. Later, the main character's younger brother became a swordsman.

Answer 1

I don't think it'll necessarily meet your needs, but I'll try my best to recommend a novel that's most relevant to your description."A Demon Husband at Home: The Daily Diary of the Fox Fairy" is a modern romance novel written by the author, Yanyu Yanyu. The general plot of this novel is as follows:

He had thought that he had picked up an injured and cute fox, but he did not expect it to be an enchanting and beautiful fox fairy! So be it if it was Hu Immortal, but what was the meaning of this guy always staying in his house? Going through the illusion, catching the demon king…In short, our cute female lead's life seemed to have become a little…different after meeting the fox fairy beauty.
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"Little Fox Dumb Cutie: Don't Be Self-Respected, Your Highness" was an ancient romance novel written by the author, Fu Dai. The general plot of this novel was:

The little nine-tailed fox in the forest had the opportunity to obtain the spiritual power that the male protagonist had dispersed when he fell into the human world in his previous life. After many years of cultivation, he had transformed into a human. From then on, he officially bid farewell to a group of fox children and became a human. Then, she met the male lead and started a relationship with him…
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请看作者正直脸(.~^~.) This was a story of being spoiled.
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"The Modern Romance of the Nine-Tailed Fox" was a fantasy and magical romance novel written by the author, Huo Lingxie. The general plot of this novel was:

*
A nine-tailed fox that had been frozen for a thousand years was lucky enough to be reborn due to the warming of the climate. She came to her old place to find her marriage again.
*
He, Yue Xiaosheng, had undergone a genetic mutation. He had turned from a powerful and heroic general into a timid, submissive bank employee who would turn pale at the mention of his wife.
He, Diao Decai, the damned Taoist priest who had sealed her, had turned from an old Taoist priest of the underworld who had been pursuing immortality and did not enter the mortal world into a greedy, lustful, and greasy leather dealer.
&&&&
He, Zhang Fan, was the man who was willing to accompany her in her stupor and was truly willing to understand her, but he was repeatedly rejected by her.
* Fragment 1 *
"Young Master, don't you recognize Little Fox?"
"I ~ I ~ I don't ~ know ~ you."
Young Master, you really don't want Little Fox anymore?" The ghostly figure was very sad.
"Miss ~ Little Fox, I ~ I ~ really don't know you. You ~ If you have any problems, you can ~ find the King of Hell to solve them."
"Young Master, I'm Little Fox! Take a good look at me. I'm really Little Fox." Foxy wanted to walk forward, wanting him to see more clearly.
"You! Don't come over." Yue Xiaosheng hurriedly took two steps back.
"Young Master, it wasn't easy for Little Fox to find you. Little Fox wants to go home with you."
"Ah?" Yue Xiaosheng's heart almost jumped out of his chest. Could it be that this female ghost was really pestering him?
* Fragment 2 *
"Haha! Foxy, I've finally caught you!"
"Stinky old Daoist, I haven't finished my thousand-year-old grudge with you! You came to me of your own accord."
"Foxy, do you know how much your tail is worth now? Ten thousand! And it's in US dollars."
"Diao Decai, you will die a horrible death!"
"Foxy, stop struggling. Look! I've already extracted your genes. I'll clone eight to ten of them first and then raise them in batches. In less than two years, I'll become a super millionaire. Hahaha, hahaha!"
* Fragment 3 *
"Nine-tailed Fox, your cultivation is complete. You can go to the Heavenly Court and be ranked among the immortals."
"No, Grand Supreme Elder, please let Little Fox stay in the mortal world and reincarnate in the human world."
* Fragment 4 *
"Young Master, don't be sad. Little Fox will be reborn, reborn, reborn. I can be reborn as a human and accompany you through life and death."
"Little Fox, I'll come to the next life, to the next life, to the next life. I'll be waiting for you."
"Young Master, raise our daughter." In an instant, the little fox's flesh and soul scattered, leaving only a clean fox skin.
Please accept it. Coffee, flowers, if you like Foxy, please throw them all at me.
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"A Demon Wife" was a novel written by the author, Ethereal Mirage. The general plot of the novel was:

Grandma arranged a marriage for me. After I got married, I found out that the daughter-in-law I married was a vixen…
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"The True Story of Fox Fairy" was a Xianxia novel written by the author, Detective Fox. The general plot of this novel was:

Virtue to birds and animals, then the fox nine tails; Suisui white fox, nine tails Pang Pang; When the world is peaceful, it is an auspicious sign. Reincarnated as a white fox with its memories, sensing the mysteries of heaven and earth, peering into the world, seeking immortality.
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"Forcibly Marry a Vixen: The Cold Young Master's Favorite Wife" was a modern romance novel written by the author Heng Tangshui. The general plot of this novel was:

[Closed] On the night before the engagement, they caught her in bed. Her fiancé hugged Xiao N on their wedding bed and said to her,"Let's break up. How can a woman like you be feminine?" She, as a low-key Silver Fox clan that walked the world, actually ended up without any femininity? She was a fox! Beaver! Spirit! It was just that her growth wasn't very good... However, her melodramatic life wasn't over yet. She was wandering in the wild, heartbroken and depressed, but she was actually adopted and imprisoned as a pet. In the mansion, a certain shameless man actually wanted to bring her for surgery? The domineering and cold emperor looked on from the corner of his eye. Was this a human or a fox? PS: The male protagonist is overbearing and cold, while the female protagonist is cunning and cunning. It's not to be missed.
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The book "The Fox Is Going Down the Mountain" was written by the author Mi Xiangjun, and it was a novel about the adventures of immortals and heroes. The general plot of this novel was:

A long time ago, there was a fox in Qing Qiu that loved eating carrots. The first time the fox went down the mountain, it was caught by a smelly Taoist priest. In order to escape from the Taoist priest's demonic claws, she pretended to be pitiful, wronged, played the role of a white lotus, and rolled around to flatter him. But how did the stinky Daoist priest become a high-level god with deep cultivation? How did I unknowingly become his mount? In this world, he was probably the only one who would use a fox as a mount. Until someone said that a fox was not a fox, and a Taoist priest was not a Taoist priest. Until one day, the Taoist priest could no longer wait for that little fox.
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The Fox King's Wife was a mystery detective novel written by the author, Lan Hanxing. The general plot of the novel was:

️My name is Lu Qingyang. On the day of Jingzhe, my mother secretly gave birth to me in an abandoned fox temple. After I grew up, a strange blood picture of a demon fox worshipping the Big Dipper appeared on my waist. From then on, I was plagued by bad luck. In order to find the mysterious man who stole my eyes, I met the Fox King Immortal Lord with dimples on his lips and a bewitching smile. However, I didn't expect that all of this was just the beginning of my reincarnation…
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"A Pet Becomes a Husband: The Demon King's Cute Wife" was a Xianxia novel written by the author Hui Luoluo. The general plot of this novel was:

The little princess of the Phoenix Clan and Yi Zhinian picked up a white fox outside and brought it back to Phoenix Mountain to raise.
Unexpectedly, this white fox was actually a spirit.
He ate her food, drank her water, and even wanted to occupy her bed at night?
"Damned Little White, quickly scram back to your nest."
His beautiful fox-like eyes narrowed slightly as he spoke lazily.
No, no, no. Your bed is more comfortable."
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"The Little Fox's Loving Wife's Cultivation" was an ancient romance novel written by the author, Wang Youran. The general plot of this novel was:

In this day and age, it was not a pie that fell from the sky, but a little wife. "Old fox" Hu Li's destined wife was a gift from the heavens. In fact, it was a gift from the Lord of Heaven. It was no different from falling from the heavens. Hu Li, who had been single for two thousand years, had always thought so. Anyway, it was a waste not to have a wife that he picked up for free. Unfortunately, it was not easy to raise a child bride. Hu Li was a man of indomitable spirit. He took care of his wife, Yan Wei, day and night. When he finally raised her into an adult, he wanted to enjoy her alone. In the end, his wife was stubborn and had a temper. She ran away from home and entered the human world. In the human world, there was a wave of resentment and hatred, but this girl lived in the grass and did not touch a single leaf. She only became enlightened after getting into a relationship debt and waited for her husband, Hu Li, to pick up the pieces. This was a love and hate story, a sweet and cruel story! Please follow the author and watch the story of Little Fox's beloved wife! Welcome to the pit!