I agree with the person above - to make an inference indeed means to figure out the hidden meaning of a text. Usually, you would do this based on some clues that the author has written over the course of the novel you are reading at the moment.
Answer:
Start your story with the premise of him being a alone but build his character up.
Explanation: Are you going for a first person autobiography of a 16 year old teen with his siblings making their way in the world? That sounds cool but honestly you kinda have the story set already to me. A bunch of siblings trying to survive by themselves. The big brother is trying to keep up with taking care of his siblings. It sounds like a great story!
In the excerpt from walking with the wind : A memoir of the movement,the figurative language that is used as an implicit persuasive device would be : The Revolution is at hand, and we must free ourselves of the chain of political and economic slavery. This sentence persuade the listeners to join the revolution.Hope this helps