It's nice to see how even though Zipp had her little issues with her mom, that they aren't affecting her enough to not want to help her mom. I'm glad that the sisters are very caring towards Queen Haven and that Queen Haven is the same towards them. Usually in media, the queen is overly strict or the princesses are overly rebellious, so it's nice to see a royal family where they can both get along well and still have their flaws every now and then.
I have always wondered about the king, though. Did he pass on like Sunny's father, did he get thrown out...is he the father?! Nah, probably not, not only would that be way too scandalous for Queen Haven to be with an earth pony at the time, Pipp and Zipp share no resemblance to Argyle.