the brother was put up for adoption at birth because the parents weren't ready to be responsible for a child as they were 15/16 themselves. a decade later is when they had kade which was essentially hell on earth for him and a younger sibling until both parents died in 2008. the brother had no knowledge of his birth parents but likely figured out he was adopted at some point in his life, he'd be roughly 32 at this point and kade only reached out to him around this time last year. other than that, essentially everything else is up to your creative desires.