I believe that what the author wants us to learn is that living as an immigrant family is not ideal. It is a terrible experience but, in a way, living as an immigrant family really helped Francisco Jimenez. I think the author want us to realize that there is a lot of responsibility in being an immigrant family and that life is never just easy. There is many privileges that their family did not get.
The character Panchito reminds me of my grandpa. My grandpa was an immigrant child and was not able to go to school. He had to work in the fields all day and had to deal with a lot of responsibilities in taking care of his siblings and working in the hot sun all day long. He had some bad experiences like Panchito but in the long run, it helped him when he got older.
I have to say that I loved the book so much. I first realized that I liked the book in the second chapter when the story started to get deeper and there was a stronger story happening.