Viewing last 25 versions of comment by Background Pony #48F8 on image #1936034

That one comic said in one screen that they might be sisters, without specifically naming them (though who else those sirens would have been).
 
Before that we had many years without any information, and not all people have read comics or care about what they say.
I  
So while it's probably canon that they are, in my personal opinion, it's also a worse story if they are sisters instead of just three non-related people who got working together to do the stuff they did. Everyone's always related in children's shows.

That one comic said in one screen that they might be sisters, without specifically naming them (though who else those sirens would have been).
Before that we had many years without any information, and not all people have read comics or care about what they say.
In my personal opinion, it's also a worse story if they are sisters instead of just three non-related people who got working together to do the stuff they did. Everyone's always related in children's shows.