Twenty-One Children

My brother and his wife have a bad habit.
They actually breed more than rabbits.
Last week my Sister-In-Law had child number 21.
They have thirteen daughters and eight sons.
To be able to pay for their college tuitions, my brother will have to get three more jobs.
He may also become a thief to get the money, lock your doors or you may get robbed.
They intend to have four more babies, twenty-five is their goal.
My brother and his wife should seriously consider birth control.

(This is a fictional poem)