A more thorough explanation:

Definition: Cognati is a Latin term used in Roman law to refer to a person who is related to another person through a common ancestor. It is also known as cognate.

Example: If two siblings have a common father, then they are cognati to each other.

Explanation: The example illustrates that the siblings are related to each other through their father, who is their common ancestor. Therefore, they are cognati to each other.