I think so. Neptune and Uranus obviously love each other, and I think that there is mutual respect given to and from Pluto. Saturn is a bit tricky because I think that the other three are protective of her but they also see her as an equal peer. I also think that Saturn looks up to the other three. I think that at the end of the day they do care about each other and would do anything for each other but I also think that all four of them have to ability to sacrifice their relationship for the greater good (or The Mission as some would call it).