Discussion has been weeded out, he called Pharynx his “Elder Broodmate”, meaning that “brother” is a very loose term he’s using as “another changeling that hatched around the same time as me”.

@Keith Mowz  
That was never stated though. We’re arguing head canon at this point.

@Ihhh  
Okay.
 
But only ONE brother is a problem, so it is not in any way grammatically incorrect or unusual to not imply that he has multiple brothers when only talking about a specific individual.

@Ihhh  

@Ihhh
 
@Daneasaur  

 
Me too, most people do that.

@Ihhh  
I have two brothers, if referring to only one of them, I frequently will still say “my brother”.

@PonyPon  
If he thought he had tons of brothers, he would have said “one of my brothers”, not “my brother”, which implies a few at most.

@Ihhh  
Because he’s one of the lings doing this.
 
And no one said he only had one.

@PonyPon  
Then why does he refer to his brother as if he only has one?

@Ihhh  
He could be assuming a relationship because he hatched alongside those other changelings.
 
They could all be assuming such connections.

@PonyPon  
How would he know who he was related to if he never knew who his parents were? Why are we even making all these assumptions?

@PonyPon  
true

@Ihhh  
He remembered being a baby and being different from other changelings, did he not?
 
You saw that flashback.

@PonyPon  
How would he know?

@Ihhh
 
@PonyPon  

@Daneasaur  
If all the eggs were stolen, how would Thorax know that someone was his brother?

@Ihhh  
Quite the question. I’d bring up more theories (such as the possibility that Chrysalis stole away entire batches of eggs in order to brainwash/groom them to being subservient and hiding their identities), but I think we’ll learn plenty with Thorax’s brother.

@Daneasaur  
What about Thorax’s parents?

@Daneasaur  
That’s a bit more complicated than just saying it’s tradition.

@PonyPon  
Thorax’s brother is one of the ones sticking with the “old” way. This would lead me to assume that Thorax and his brother are around the same ages from the same batch which may qualify for them to be much older than we may expect.

@Daneasaur  
I’m not following that logic.
 
Like, no mature changelings in the nursery is weird, but not quite proof there were none at all at the time.

I think everyone is forgetting something.
 
Thorax mentioned that they have been under her rule for hundreds of years. Considering there were no mature changelings in the nursery, Thorax may be several hundred years old.

@Background Pony #8105  
Possibly, but unlikely considering the bias the writing tends to have when it comes to other races.

@PonyPon  
@Hebbocake  
That would really make Chrysalis evil, then, considering she still decided on conquering Equestria instead of working together with the ponies. (That, or the ponies are evil for rejecting the Changelings so thoroughly that they feel conquering them is the only way. I’m sure that’s also a possibility, right?)

@Background Pony #8105  
Maybe, we simply don’t know.