Answer:
Is your advice acted upon by your younger brother?
Step-by-step explanation:
The passive voice is the form of voice construction in grammar that shows an interest in the object that experiences the action rather than the subject of the sentence that starts/does the action. In such construction, the subject and object are interchanged in their position, with the focus changed to the receiver of the action rather than the doer.
In the given sentence, the word "advice" is the object while the younger brother is the subject. So, the places of these words will be interchanged in the sentence, making the subject come to the end of the sentence while the other will be at the fore of the sentence.
Thus, the correct sentence in the passive voice will be-
Is your advice acted upon by your younger brother?