How to write a humorous dialogue for a little girl and a dog?

I want to stay until next week when I don't want to go to school.

The father said to his son, "Don't go to school today.

Last night, your mother gave birth to two brothers.

Just tell the teacher. "

The son replied: "Dad, I only said that I gave birth to one;

The other one, I want to save it for next week when I don't want to go to school!