At one year old:
"Baby, kiss big brother."
"Mua~"
At the age of ten:
"Baby, kiss big brother."
"Don't call me baby! Mua~"
At the age of seventeen:
"Kiss brother."
"Brother, I have grown up!"
At the age of eighteen:
"Baby, kiss big brother."
"Yeah~ Brother, ha..."
"Be good."
"Mua~"