What does it mean that the family business has ups and downs and the family style is positive?

The phrase "the family business has ups and downs, and the family style is not crooked" means that the family's ups and downs change with the individual's efforts and talents, while the family style represents the family's traditions and moral qualities and is consistent.

This sentence emphasizes the influence of people's subjective efforts and talents on the fate of the family, and the reputation and moral quality of the family are judged according to everyone's performance and will not change because of the family background or tradition.

So this sentence means that the rise and fall of a family depends on individual performance, and the tradition and moral quality of the family are consistent.