Perhaps the story in the 'snape's secret family fanfiction' is centered around how Snape's secret family discovers his double life. His family might be living in a secluded place, and they start to suspect something when Snape is constantly away on 'business' for Hogwarts. They could then start to investigate and uncover the truth about his role in the fight against the Dark Lord.
One possible plot twist could be that Snape's secret family has a hidden magical ability that is crucial to the wizarding world. Maybe his family has the power to reverse dark magic spells, and this is something Voldemort has been searching for all along.
His wife could be a former Hogwarts student he met during his own school days. She might be from a different house and they fell in love secretly.
The plot could revolve around her search for her father's legacy. Since Snape had a complex life, she might find out about his double - agent role in the wizarding war. She may also have to deal with the fact that not everyone in the wizarding world will be accepting of her due to Snape's controversial past. This could lead to her having to prove herself and make her own mark in the wizarding world.
His secret family could also include an elderly relative, like a grandfather. This grandfather could have passed on some important family secrets to Snape, secrets that are related to a powerful magical artifact. And the family has been guarding this artifact for generations.
Well, it could be about the daughter of Snape secretly having feelings for Draco Malfoy. Maybe she's been in the shadows all this time, and when she meets Draco, there's an instant attraction. Their relationship might develop against the backdrop of the wizarding world's politics and power struggles.
If she discovers some of Snape's old potions recipes or magical knowledge, she could share it with the Hogwarts faculty and students. This would not only improve the potions classes but also make her a respected figure in the school. And her presence might also make the students re - evaluate their views on Snape, which would in turn change the overall atmosphere at Hogwarts.
It could be a random witch that Snape had a brief encounter with. Maybe she was someone he met during his time as a Death Eater or while he was spying for Dumbledore. She could have been a fellow Hogwarts student from his youth that he had a secret relationship with.
One possible plot could be that Naruto, Sasuke and Sakura end up in a situation where they have to form a secret family for a mission. Maybe they have to infiltrate an enemy organization that only allows families to enter. So they pretend to be a family, with Naruto and Sakura as the parents and Sasuke as their adopted son. Along the way, they start to develop real family - like bonds, learning about each other's strengths and weaknesses, and protecting one another.
One plot twist could be that Snape discovers a hidden secret about Harry's family that changes his whole perception of them. For example, he might find out that there was a prophecy related to Harry that was different from what everyone thought.
Well, perhaps Harry stumbles upon Snape's family in an unexpected place like an old family manor. Maybe he discovers Snape has a long - lost sister who has powers similar to Snape's but has been hidden away for some reason.