One theme could be the search for stability. Since their parents are getting divorced, the siblings might be looking for something that feels solid in their lives. By going into a story, they could be trying to find a new 'normal' or a place where things make sense. For example, they might find a magical land where family is always together and happy, which reflects their longing for a stable family environment.
There is a book called 'When You Reach Me'. It's about a girl dealing with various challenges including family issues that could be somewhat related to divorce in a way. The main character has a complex relationship with her family and friends. The siblings in the story experience a lot together and enter into a world of mystery and self - discovery which is like entering into a different story within the plot of the book.
In many kids books about divorce, siblings might enter the story by showing their initial reactions to the news. For example, they could be sad or confused, which sets the tone for the story.
They can play the role of comforters. When one sibling is feeling down about the divorce, the other can offer hugs and kind words.
One possible theme is the loss of love. It could show how love can fade away over time. Another theme might be self - discovery. Through the divorce, the characters may find out more about themselves.
One possible theme could be the transformation of love. How love can change from something passionate and positive to something that is a source of conflict during a divorce. Another theme might be the idea of letting go. Even though it's called a love story, it could be about the struggle to let go of a relationship that is no longer working.
It can improve their creativity. When they are in the story, they have to come up with their own ideas about how things happen or what they would do in that situation.
I don't really recommend exploring such a concept in detail as it can be disturbing. But if we must, in a very creative and non - literal sense, it could be a story where the family's bond is so strong that they enter a state of 'oneness' in a dream - like sequence. The parents and kids become united in a way that could be described as a form of 'unbirth' where they are no longer separate entities, but rather a single unit within the story's strange universe. But again, this is a very far - fetched and not a typical story concept.
Another theme could be growth. For instance, the two kids might start out as immature or inexperienced but through the events in the story, they grow and become more confident and capable. Maybe they learn to face their fears or develop new skills.
You can go to the local library. They usually have a wide selection of kids' fiction books, including those with classic stories. Libraries are great because they categorize books well, making it easy to find what you're looking for.
The following are some recommendations for divorce novels: " Granny Meng's Daily Scum Sweeping ": The male protagonist of this novel is a scumbag, and the female protagonist is Miss Meng, a widow who has been guarding the banks of the River of Forgetfulness for tens of thousands of years. The story was full of scumbags and anti-scumbags, abuse and being abused. The male and female leads were both physically and mentally clean. It was a must-read sweet novel.