What should Carlisle's adviser recommend, given Carlisle's concern about appointing his frequently traveling brother?

A Substitute Power of Attorney is particularly relevant in this scenario because it addresses Carlisle’s concerns about appointing his brother, who frequently travels. This legal document allows for a designated agent to act on behalf of the principal when the primary agent is unable or unavailable to perform their duties. Given the brother's travel schedule, there is a possibility that he may not always be available to make decisions or take action when needed.

By opting for a Substitute Power of Attorney, Carlisle can ensure that someone is always able to manage affairs on his behalf, regardless of his brother’s availability. This provides a layer of continuity and ensures that Carlisle's interests remain protected even when the designated agent isn't physically present or accessible.

Other options such as a Contingent Power of Attorney, Personal Care Power of Attorney, and Power of Attorney for Property do not address the specific concern about the brother’s frequent travel. Contingent Power of Attorney typically comes into play under specific circumstances or conditions rather than addressing availability issues. Personal Care Power of Attorney focuses on healthcare decisions rather than financial matters, and Power of Attorney for Property is generally limited to financial transactions without consideration of the agent's availability. Thus, the Substitute Power of Attorney emerges as the most appropriate recommendation for Carlisle's situation.