I have twins and we always refer to them in the same order for some reason, eg it’s Adam and James. This is also the order they were born in, Adam was born first. I know lots of other twins but only one set do I know the birth order, and they are also normally said with the oldest first. I know it’s normal for siblings to go in birth/age order when writing cards etc.
So from the twins you know, are they always said in birth order? I’m just musing on a Friday night!