This is an extremely unethical and immoral situation. Incestuous relationships like this go against basic moral and ethical values in society. It can cause serious harm to the individuals involved, both psychologically and physically, and also has a negative impact on family relationships.
One story could be that the son gets good grades in school. His parents have always emphasized the importance of education. When he brings home a report card full of A's, it really pleases his mom and dad. They are proud of his hard work and dedication to his studies.
In a family, the mom and son might be working on a DIY project in the garage, like building a small bookshelf. Meanwhile, the dad and daughter are in the kitchen baking cookies. These activities not only bring them closer as family units but also create memories. Each pair has their own way of interacting and having fun, which is an important part of family life.
Yes, in almost every culture, this is a huge taboo. Incest is considered unacceptable across the board. Cultures uphold values that promote healthy family relations and this goes against all of that.
In such stories, it's mostly negative. When a son makes his parents seem like slaves, it shows a lack of respect. Parents are supposed to be cared for and respected. It can also be a sign of the son being spoiled and having improper values.
That could be a really interesting situation. Maybe they are sharing a moment of bonding over exciting tales. The mom might be happy to see them so engaged.
Maybe the son cooks a delicious meal for his parents. He spends the whole day preparing their favorite dishes. When his mom and dad come home and see the table full of food, they are overjoyed. This act of kindness and thoughtfulness pleases them a great deal.
In a story, the son might force his mom and dad to adopt a pet. He loves animals so much and keeps on begging them. He does research on the responsibilities and shows them how having a pet can be good for the family. Eventually, they give in and the family gets a cute little puppy. The puppy then brings a lot of joy to the family.