Which of the following is not considered a legal privilege in court to avoid testifying against each other?

In legal contexts, the concept of privilege relates to certain relationships that allow individuals to avoid testifying against one another in court. Among the options provided, the spousal privilege and cleric-penitent privilege are recognized legal privileges that protect certain communications from being disclosed in court. Spouses typically cannot be forced to testify against each other, thus preserving the confidentiality and integrity of their relationship. Clerics also enjoy the privilege concerning confessions or spiritual communications made in a confidential setting.

On the other hand, siblings do not have the same automatic legal privilege as spouses or clergy when it comes to being compelled to testify against one another. While siblings might share familial ties, the law does not extend a formal privilege to them, meaning that their testimony can be required in court. This distinction makes the scenario of siblings trying to avoid testifying against each other not legally protected in the same way as with spouses or clergy.