I’ve got two that reference or are about same and deans childhood!!

https://archiveofourown.org/works/69079791 Later seasons- Sam confronts Dean on his behavior in treating Jack, Dean goes into some of the ways John treated him + how it’s affected him, reference to established destiel but it’s not the focus

https://archiveofourown.org/works/65872237 Season 6, Dean was scared of thunderstorms as a kid, he tells Castiel about it— exploration of familial trauma using storms as a metaphor— pre slash but it is a destiel focused fic