It was the cover of this tune, by Stories, that was a big hit in the US in 1973. The arrangements of the songs are different. Hot Chocolate has more of a soul feel, with flangy guitars and strings, while Stories rocks the guitars more, but the biggest difference in this story of interracial love is the point of view.
Hot Chocolate wrote the song, so you have to give their version primacy. In Hot Chocolate’s version, contrasting vignettes of Louie and his gal at their respective parents’ homes, and their fathers’ spoken word intolerance demonstrate that there is no difference between black and white in the worst possible way.
Stories version changes the story, as it were. Louie brings his black gal home and there is some kind of unspecified scene. That’s it. Gone is the equal opportunity prejudice, as well as the strings and the spoken word. In Stories’ version the white parents are the bad guys, in a vague way, and they shouldn’t be. You know what I mean?
I remember at the time hearing that this song was an answer song to Richard Berry’s Louie Louie, which is apparently not true.
Louie C.K. adopted Brother Louie as the theme song for his show, Louie, in which he plays a dad in an interracial marriage that is now defunct. Interestingly, the show uses the Hot Chocolate arrangement of the song, with vocals by Stories’ Ian Lloyd.