Cas has a younger sister named Kate Chuck was gone after he created her so Cas decided he should be her angelic spirit. When Dean, Sam, and Cas became good friends Cas introduced them to his younger sibling.
Kate this is Dean and Sam! Cas was more than excited to show his new human friends his younger sister.
Kate was hiding behind Cas' leg because she was only 1,000 years old which was 5 in human years.
Hey, Sam was confused as why an angel would want to hide from a powerless human like him.
Dean and Sam this is Kate she is only 5, Cas was still very excited.
Hey there Kate! Dean was confused as why Kate had ginger hair while Cas had brown hair though they both had blue eyes.
Hello Sam and Dean, Kate peeked to see the tall boys from behind Castiels legs.
I'm sorry she has never seen a human before, Cas knew his sister would be very timid when meeting her first human
Kate started speaking Enochian so Castiel had to tell her to stop.
Kate they don't understand enochian you have to speak English! Castiel was a little annoyed but, they had always spoke Enochian so he understood.
I am sorry! Kate was very embarrassed that she had messed up in front of the very cute boys.
Hey, it's alright! Dean remembered Sam when he was this young.
Yeah! We mess up all the time too! Sam was trying to comfort her when he bent down to her level and came towards her but, she declined.
Then when Sam was about to get up Kate ran into his arms.
Oh okay we're doing that! Sam was very happy with the innocence of this angel child that was holding him tightly.
Cas then looked at Dean and shrugged.