I do indeed want it to be for all ages to enjoy. It was originally written as a screenplay which had a very 'Disney channel' vibe to it. I had wanted to do something about it for ages and with my lack of contacts in the movie business, here we are today.
Jasmine and Terry Jane see the other person as friends or rivals?
Jasmine and TJ have very different interests, so they don't really have any reason to see each other as rivals. There might be a chance to add a little bit of rivalry in if Jasmine decides to persue Johnno however.
Do Eric, Tyler, and Johnno get along?
Eric and Tyler sort of do, though because of their age difference they don't really have as much to do with one another.
Eric sometimes protective about Jasmine, and wants her to find the right person?
Eric actually would be, which TJ finds out after the switch. Jasmine doesn't really have a chance to find out that because she has no love interests pre-switch. Again, there's a chance to show some of that if Jasmine persues Johnno (though that was always an afterthought ending).
Tyler however wouldn't care less about TJ's romantic choices. But he's not the older brother.