The Poisonous Doctor

They are four-year-old children, what Look at the sister's old face, I thought this wasn't a four-year-old doll!,"Alright, Dabao, you're the older brother, so you need to listen to your younger sister. Xiaobao, you're the younger sister, so you need to listen to your older brother.",Both children, for once, were in agreement and asked in unison, "So who do we listen to"。