I think the actor Robert Sloan would be the kid to go with as Joseph In the movie Orbiting Jupiter. I would pick him to cast for Joseph because he's in a horror movie and in horror movie most people are serious in the situation their in Robert Sloan acted in the movie sinister 2 rated one of the scariest movies of 2015. Joseph is a serious kid and hes gone through a lot just like Robert in sinister 2. I also think they show some of the same traits darker hair and darker eyes. Robert was also the kid in sinister 2 that was always the most serious out of the people in the family because he new that something was wrong with his sibling. They also relate good because they are very open about what their saying, Joseph also doesn't care about what people say about him he just has passion for what he says just like Robert Sloan. Both of their family's relate good to because they show that their children are a bit strange but they know that they have some special talent inside them like Joseph might be very athletic because if he can climb the rope to the sealing in 30 seconds with 2 hands and know legs. So in my opinion I would pick Robert Sloan to play the lead roll of Joseph.
I think the actor Owen Vaccaro would be Jack because I think they would show some of the same traits. Owen and Jack show athletic traits Owen plays on his school basketball team and Jack can climb up the rope under a minute. Their both 10 years old and their both in grade 6 and they both have weird siblings. Jack has a step brother named Joseph and Owen has Scarlet Estevez. They both have nice family's to even tho Owen had a step Dad he was still very nice. They also show kindness to their friends at school and friends out side of school. Jack also shows respect to his friends same with Owen. Owen in the movie Daddy's Home gets bullied and I have a feeling that later on in the book Jack will get picked on by Kids and Joseph will be their to stand up for him. Also in the movie Daddy's Home theirs a dog nicknamed Tumor because they say he (He grows on you) The dog doesn't like Brad his step dad same thing with rose she does not like Some people but if you rub her rump she does like you. So in my opinion I would pick Owen Vaccaro to play the lead roll as Jack.
I would pick Arnold Schwarzenegger to be Mr. Canton. I would pick Arnold to be Mr. Canton because they both have an identical attitude they don't take any crap from anyone they like things done how they want it to be done and their very strict,and like to work alone. Arnold in most movies he acted in was a hero or the good guy he liked people to follow the rules and didn't take any crap from bad guys or Villon's I think that relates to Mr. Canton good because he likes people following the rules all the time and he doesn't take crap from little kids. As a vice principal their normally older then the average teacher their normally in their 40-60 and Arnold is 65 years old so I think he would fit into the roll perfectly as the vice principal. Also in the movie ( Conan the Barbarian) a movie Arnold Played in every won treated him like the leader of his village just like Mr. Canton every treats him like he's the leader of their school. Most people don't like Mr. Canton because they think he's to strict Arnold in most of movies is a strict leader of his village, town, city because he likes people to follow his rules because he likes a good village, town or city because he doesn't want people to be hurt, harmed, or killed. So in my opinion I would Pick Arnold Schwarzenegger to play the leader roll of Mr. Canton.