A more thorough explanation:

Definition: Secondary affinity is a type of relationship that exists between a spouse and the marital relatives of the other spouse. It is different from direct affinity, which is the relationship between a spouse and the blood relatives of the other spouse.

For example, a wife is related by secondary affinity to her husband's sister-in-law. This means that even though they are not blood relatives, they are still considered family because of the marriage between the wife and her husband.

Another example of secondary affinity is the relationship between a husband and his wife's brother. They are not blood relatives, but they are still considered family because of the marriage between the husband and wife.

These examples illustrate how secondary affinity is a type of familial relationship that is created through marriage. It is important to understand the different types of affinity, especially in legal contexts such as inheritance or criminal law.