At first it was the fickleness off children that delayed their parents realization that their one child was actually more like two. Caster Pollux Smith was a difficult child, or so his parents thought. At different times, he would prefer a different name. At two he could prefer Caster, and then at 2:30 he might prefer Pollux. He insisted he had chosen and stuck with his name, and it was his twin that went by the other name. Their parents assumed the indecision of names was due in part by an imaginary friend, and a troublemaking quality that would come out at the same time Pollux did.
In fact it wasn't until the twins were eleven, and by all accounts should have been out of the imaginary friend phase, that their parents started to wonder if there were two children inside the body of their one. As for Caster and Pollux, they disliked the stress their switches caused their parents, and often found themselves at the library. Pollux was unaware that Caster was searching for a tale he heard long ago, and assumed this was just how his brother relieved stress. He had always been the quieter and more thoughtful of the two, and so it was him that took it upon himself to ease the tensions in their household.
"What's this obsession with old gods you've had lately. It's all you look at in the library, nothing exciting like sword fights and daring rescues." Pollux chided. It wasn't meant to be hurtful, it never was, but it irked Caster all the same.
"As if you've been dealing with this any better. You've taken to long-term pranks. You never do those, you're too impatient. It's worrying." Caster said, venom riding the edges of his voice.
"It was you that wanted me to be more patient, after all, and now once I've developed that patience? Telling me to go back to quick, short pranks?"
This was another problem. Although Caster and Pollux got along better than most siblings, they had their spats, and when the two resided in the same body there was nowhere to go.