Based on prior knowledge, marital status can potentially be a strong indicator of a person's income. Typically, married individuals may have more stable and higher-paying jobs compared to never-married or divorced individuals. However, it is important to note that this relationship may not hold true for all cases. There can be exceptions where divorced or never-married individuals may have high-paying jobs. 

Based on this analysis, here is the dictionary:

```json
{
  "no": ["Never-married", "Divorced", "Separated"],
  "yes": ["Married-civ-spouse", "Married-spouse-absent", "Married-AF-spouse"]
}
```

In this case, the "no" class represents individuals who earn less than or equal to 50000 dollars per year, and the "yes" class represents individuals who earn more than 50000 dollars per year.

Please note that the values "Widowed" have been excluded as they do not provide clear information on the income level.