Zack knows David is his brother but I am not sure the whole who is related to who thing has caught on yet and what being related really means.
Tonight Zack asked if David was related to him. I said 'yes but do you know how he is related to you?'
*Here is the point I was expecting him to say "yes, he is my brother."
He responded with "yes you hatched him!"
Apparently I need to start teaching him how babies are born!
1 hour ago