What is the appropriate relationship denoted in "your mother's husband's sister is my aunt"?

In the statement "your mother's husband's sister is my aunt," the relationship can be broken down for clarity. Here, "your mother's husband" refers to your father. So, "your mother's husband's sister" means your father's sister. Your father's sister is indeed your aunt. Thus, when the speaker says this person is their aunt, it confirms that the correct answer is "aunt" rather than "brother."

The context of the relationships depicted is that the term "aunt" captures the familial link correctly. Therefore, the statement accurately identifies the speaker's aunt as the sister of your father (your mother's husband). The options that refer to brother, sister, and father do not fit the relationship described, as they either pertain to different familial connections or roles not relevant in this scenario. Thus, the appropriate relationship presented here is that of an aunt, affirming the connection clearly established in the statement.