I realize that some people may still be sensitive concerning Pluto's declassification as a "planet" by the IAU. However, what the IAU did not do was establish exactly what Pluto is. As a result, Pluto is now considered a "Trans-Neptunian Object", a "Kuiper Belt Object", a "Plutoid", a "Dwarf Planet", a "Minor Planet", and a "Planetoid." One thing that does set Pluto apart from all the other planets is that its orbit is not in the same ecliptic plane as the rest of the planets. While its eccentric orbit does bring Pluto within the orbit of Neptune, it never actually crosses Neptune's orbit because Pluto's orbit is at a completely different angle. So there is no gravitational influence by Neptune on Pluto, or visa versa. Considering the four new moons recently discovered around Pluto, Charon making five moons, perhaps Pluto might be considered a "collisional family." What do you think?