Sure, Fizzlepop loves her apprentice/adopted sister as much as she can love anything, but there are times, oh lordy there are times, when she would just love to swing by a nice big mountain and dump the little twerp on it.
So in short, they have as healthy a relationship as any two siblings could have.
Fortunately for Sunny, this urge to find a particularly tall peak fades after the first cup of coffee. Saddle Arabian coffee beans will make even the grumpiest of grumpy-pants smile. Or at least frown slightly less.
So come on, Tempest. Open up your eyes. https://www.youtube.com/watch?v=HvwJoeVEPrw
Okay for real this time comms are next.