Very similar to Dade, his siblings have buck teeth, puffy cheeks, fluffy brown fur (some have different shades), and short feet. They look different in "Nightclub Night" as they appear older and have bigger cheeks and four fingers instead of the usual three shown. However, since Dade says that it's his "family" protesting the nightclub, it's possible that they are not all his siblings.
Their personalities are very similar to Dade's; they hate trouble. They love and support their big brother, but sometimes they tick off Dade for fun.