I keep having unknown people in the house! Heh. That would be JE calling SE by another name, depending on what character she (JE) is supposed to be at the time. If she decides she's Peppa Pig, she will call SE 'George' (little brother of Peppa Pig). If she's Elsa at the time, she will call SE 'Anna' (from Frozen). Surprisingly SE will respond to the new name!
Rexxxx! Come here and take photo
(I still have no idea where 'Rex' comes from)
Look at the camera, George
I suppose when SE can talk well enough to call JE, the number of unknown people will double!