It doesn’t matter how many edgy “theories” people try to make–Mario and Luigi are supportive, caring Good Brothers all throughout the history of the canon.

Like… so many things have been retconned to there and back again, like the Brooklyn origins of the bros, their last name, or the nature of the Koopalings’ relation to Bowser…

But that Mario and Luigi are the best, supportive sibling team has never been retconned or questioned.