A sister-in-law referred to her husband's younger sister. Among the relatives, the husband's sister was called sister-in-law. In some places, she was also called a granny. His sister-in-law's partner was called his sister-in-law. The relationship between sister-in-law and sister-in-law was called sister-in-law.
I'm not sure if you're referring to the plot of a Korean drama or a novel. If you can provide more information, I can try my best to answer your questions.
Another way is to make her write an apology letter if she has hurt someone's feelings. This helps her reflect on her actions. For instance, if she said something unkind to a friend, writing a sincere apology letter would make her realize the impact of her words and also improve her communication skills in the long run.
There could be a mysterious old neighbor. This neighbor might have some knowledge about magic or strange phenomena. When the little sister shrinks, the neighbor could offer some clues or tools to help her return to her normal size. Maybe the neighbor has had a similar experience in the past and can guide the little sister through her ordeal.
The parents would be important characters. They could have different reactions. Maybe the father is more accepting and tries to teach the giantess little sister how to use her new power for good, while the mother is initially worried about how society will view their daughter. Their relationship with the little sister and how they deal with the situation can be a big part of the story.
"The Substitute Junior Sister Is a Gentle Green Tea Spirit","Qingyun's Afterword","Senior Sister Bai Yueguang and the Substitute Junior Sister","The Substitute Junior Sister Resigned","The Substitute Junior Sister Dressed as a Substitute Junior Sister","The Nine Senior Brothers Regret After the Substitute Junior Sister Reincarnated","What's Wrong With the Substitute Junior Sister?","The Substitute Junior Sister Resigned After Reincarnating","The latest chapter of the Substitute Junior Sister Dressed as a Substitute is not available online.""The latest chapter of the substitute junior sister (Wen Beiyu)" and other novels were all recommendations about the little junior sister being a substitute.
The following are the recommendations for a few novels about young ladies turning into demons: " Humble Girl ": This ancient romance novel tells the story of a third princess of the demon race after her fiancé broke off her engagement. 2. " Demon Girl Transformation ": This novel is about a demon girl who transforms into a demon in the Twin Moons World. Please note that these recommendations are only based on search results and I cannot guarantee their quality or content.