New Brevoort Formspring

I didn't realize this until I just read the Marvel wiki now but apparently Danny Ketch and Johnny Blaze are brothers!!! Don't know if you guys will be touching up on that in some future story about the Kale curse. If not can you recommend what issues i should read through to understand this better? Not saying its on you guys but i would have expected them to be kind of thorough about this in the movies at least since they are the main characters.