The plot might involve the grandson having a secret heritage that links him to both Kaido and Big Mom. This could be a source of great power, but also a great danger. He might be hunted by other pirates or factions who want to use him for their own gain. In the fanfic, he could start off as an underdog, but gradually grow in strength and influence, all while trying to keep his true identity a secret from Kaido and Big Mom.
To develop the grandson character, his goals and motivations need to be clear. If his goal is to learn from Kaido and Big Mom to become a great pirate himself, then his actions would be focused on impressing them and getting their teachings. On the other hand, if he wants to take them down, he would be constantly plotting and finding ways to undermine their power. His growth throughout the fanfic could be shown through his changing attitudes towards power, friendship, and loyalty. For instance, he might start off believing that power is everything but then realize the importance of loyalty and friendship through his experiences with different characters.
Jealousy can be a big reason. For example, if one mom thinks another mom's child is getting more attention or opportunities. Another reason is differences in parenting styles. If one mom is very strict and the other is more laid - back, they might clash when their kids interact.
There was a situation in a school PTA meeting. Two moms had different ideas about how to raise funds for the school. One mom wanted a bake sale, while the other thought a car wash would be better. Their argument turned into a full - blown fight with accusations flying about who was more committed to the school.
In a mom vs son wrestling story, there was this strong - willed son who challenged his mom. They started the wrestling on the grassy backyard. The mom was initially a bit hesitant but soon got into the spirit. The son tried different moves he saw on TV. However, the mom managed to use her balance and strength to keep him at bay. Eventually, they ended up in a tie and hugged each other, knowing it was all in good fun.
As of the latest chapters, Big Mom did die. The circumstances surrounding her death were quite complex and tied to a series of intense battles and plot developments.