So

When we saw the Episode Sisterhooves Social, we learned that Ruby Pinch wasn't Berry Punch's daughter, rather, it was her sister. Well, that would explain it better why she seemed like an OPPP, and being able to be a total alcoholic which would make her an irresponsible mother if fanon had it its way.

Then we saw this:

They discovered Custard wasn't as tasty as they hoped.

Yeah, Amethyst Star with Dinky, who is as fans put it, Derpy's unconfirmed Unicorn daughter. So she is Amethyst's sister so it seems, and well, since it is canon, we can now see this lil' cute filly be more than happier hoping around that not only she has family as an adult sister, but also a niece her own age as Tootsie Flute is proven to be Amethyst's daughter as revealed in The Mysterious MareDoWell.

She also has a sexy voice.

So being that Derpy Hooves AKA Ditzy Doo is Dinky's unofficial mother, we can assume that, yes, Amethyst Star is also Derpy's daughter, even though, well, both characters seem to be the same age sans the fact Derpy is a Pegasus, and Amethyst is a Unicorn...and hey, so is Dinky for that matter.

Does it matter?

Since it has been proven that siblings in the current incarnation of MLP have relatives that include all three species of pony, thanks to the "explanation" given by one Mister Cake when his newly foals arrived into the world being a Unicorn and Pegasus, while him and his wife are Earth, and already I had pointed that Berry and Ruby are indeed related but not as fans had envisioned, and they are different "races" of pony as in contrast with say, the Apple family and Pinkie Pie's family, whom are all Earth, one can state that maybe, just maybe, Derpy had adopted both Amethyst and Dinky and is their surrogate mother...or

Either case, I am looking way too much into this. Maybe Derpy is looking after Amethyst who seemingly has her own life but at the same time wants someone close as a mother, and Derpy herself has stepped into the plate.

Eh...