Don't You Understand

When Lucas is very persistent such as asking the same question 10 times when I have already answered him, I sometimes get frustrated and tell him something like 'You understood what Mommy just said. Why are you asking again?'

Yesterday, the smart aleck used the 'weapon' on me. He was calling out for his Daddy but Dominic was busy. So, I went to him and said:

Me: Daddy is busy, what do you want?
Lucas: I want Daddy, don't you understand!
Me: OK...