Dad's uncle was not usually called grandpa. Dad's uncles were usually called granduncles, and grandpa was Dad's father. Therefore, his father's uncle was not called grandfather.
There was an old legend in the family that the grandpa and uncle knew about. One stormy night, while they were all together in the family cabin, the grandpa started to tell the story. He said that long ago, an ancestor had made a deal with a dark spirit. As he was telling this, the uncle noticed strange markings on the wall that he had never seen before. Suddenly, a cold wind blew through the cabin, even though all the windows were closed. The boy could feel a sense of dread as if something was watching them from the darkness outside.
Grandpa Space brought his whole family to escape from famine. This novel was about a heroine who brought her grandfather and her family to escape from famine in ancient times. The female protagonist had a space with abundant resources that could help them survive and develop in the process of escaping famine. This novel involved farming, farming to make money, imperial examinations to enter the scholar and other topics, bringing readers a wonderful reading experience.
One idea could be that Uncle Grandpa teams up with characters from another show to go on a wacky adventure across different dimensions. Maybe he meets some characters who are lost and he uses his unique abilities to help them find their way home. Another idea is that he has a cooking competition with characters from a different universe, leading to a lot of chaos and funny food combinations.
The unknown past of the uncle and grandpa can make it scary. Maybe they had some dark secrets or were involved in something bad in the past. For example, if they had accidentally killed someone while hunting long ago and never told anyone.
I'm not sure which novel you're referring to because you didn't provide any specific information. If you can provide more context or plot, I will try my best to help you answer your questions.
First, decide which other show or universe you want to crossover with Uncle Grandpa. Then, think about how the two worlds could collide. Maybe start with a simple scenario like Uncle Grandpa getting a strange letter from that other world inviting him over. Next, introduce the characters from both sides and let their personalities clash or work together in interesting ways.
During family vacations, the dad, daughter, grandpa and uncle might play card games together. They tease each other, share stories from their lives and create a really warm and fun family atmosphere. Grandpa might tell old tales from his travels, the uncle might share some funny work experiences, and the dad could talk about his college days while the daughter listens intently and adds her own school stories.
Maybe when they all work together to build a tree - house for the daughter. Daddy does the heavy lifting, grandpa gives advice on the design, and uncle helps with the finishing touches. The daughter gets a special place of her own, and the process is full of family unity and fun.