Peach bros? There's a gender-swapped word for brother, I don't know if you know it because its so obscure, but its 'sister'.

I'm now curious what relation Daisey is to Peach. Presumably some degree of cousin, as they're both princesses in the same region. But they don't need to be blood siblings to start a plumbing business under the name "Super Peach Sisters" and fight presumably Bowsette.