@Background Pony #B656  
Its left to interpretation but when she arrived at the school, Starlight and Sunburst seemed to be expecting her at least. It wasn’t the same when she was “observing” the families of the respective members of the mane 6. It even seemed like Starlight and Sunburst were the only ones who were remotely responsive to see her.

WOOOOO!!!!! StarTrix has been sunk!!!!

I can’t believe Sunburst stopped being a wizard.
 

@Background Pony #A050  
Actually i genuinely don’t think she is.  
She never refers to them as her parents.  
They don’t act like they’re her parents and they only seem to be just meeting in a montage and showing her around the school for the first time in the montage.  
She’s significantly older the the children of big mac and pinkie.  
She seems to have the same attitude as twilight in season 1 which wouldn’t make a huge amount of sense if she was raised by starlight.  
There’s nothing at all romantic shown between starlight and sunburst.  
She doesn’t really have a similar design to starlight apart from maybe the coat colour.
 
I think it might just be that they wanted to follow the Twilight > Starlight > Sunrise theme but couldn’t come up with a more original cutie mark design.

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I knew it was their daughter since the day I saw that cutie mark. Which is yesterday.

@Background Pony #8098
 
That isn’t how shipping works
 
Look at how many Shining Armor and Cadance infidelity pics exist. And they were married from day 1.

I really really hope she’s their daughter

They’re not her parents unless she outright says “mom, dad” to them.

@Background Pony #0856  
It looks like, but it’s better to wait.

Pardon me, Starburst  
@Background Pony #0856

Oh my god is Sunburst canon too?!

@Background Pony #8098  
For what it’s worth, practically every Starlight x Trixie episode involved some major conflict between them, but they performed it that way. Their relationship may work as friends, but not as a sustainable romance.

@Background Pony #A050  
It would be natural story-wise for Twilight’s current student to be her former student’s daughter. So, is she their child?

Hmm. Not bad, Sunburst.

So is Luster Dawn Starlight x Sunbursts child?

@InuYugiHakusho  
Well, enough for me.

EH??

Is that their daughter?

StarTrix is dead. Ahaha

@sharpshadow  
In the future he will be called Sunburst the Bearded

@bigladiesman  
They end up running the School of Friendship together.

Does he just have a bigger beard?

Oh, Starlight and Sunburst got officialy shipped?