What is the best action to take if you cannot honor a prior commitment due to work obligations?

The best action in this scenario would be to communicate effectively and seek a solution that respects both your work obligations and your prior commitment. Contacting your sister to discuss the situation demonstrates responsibility and consideration. This proactive communication can help manage expectations and possibly allow for a more flexible arrangement.

By reaching out to your sister, you acknowledge your commitment to her while being transparent about your work situation. This approach can help maintain your relationship with your sister by showing that you care about her needs, while also fulfilling your professional responsibilities. It's important to prioritize both aspects of your life, and communication is a key component in balancing them effectively.

In contrast, simply agreeing to stay at work without any further communication may lead to misunderstandings or feelings of disappointment, both from your workplace and your personal relationships. Similarly, informing your manager that you cannot stay without providing context does not help maintain good workplace relationships. Relying on a friend to pick up your sister may be a solution, but it might not be the most respectful approach without first engaging directly with your sister.