[Susan d.S.]

You fuck them up, your mum and dad.
They were quite nice, till they had you.
You make them think of faults they had
And see their failings born anew.

But you’ll be fucked up in your turn*
When you decide to have a kid,
Shall half the time spout pieties,
While half in thrall to darkest id.

Child hands misery to parent.
It thickens like an arctic shelf,
Be chaste, a lone librarian
And do not reproduce yourself.

alternate:

But you'll be fucked up in your turn
When you decide to have a child,
Who half the time is soppy sweet,
And half intent to drive you wild.

or

And half obnoxious, rude, and wild.