Ok, here's what you should do...

get an RTF and an ARF AND a kit!

Then, you can start flying right away while you put the ARF together, and you can build the kit over the winter.

better get TWO kits, one for you and one for your son.

In fact, get 4, two trainers, and two intermediate planes

No, wait! Get six! 2 trainers, 2 intermediates, and 2 advanced!

While you're at it, get engines and radios for BOTH!

And a Giant Gas Plane! If money becomes a problem, you can always sell the house. (did I mention that this hobby is addicting?)