Grammarians among you may remember the book _Eats, shoots and leaves_.
In a similar vein, Winton is throwing at least one tantrum daily over the following punctuation problem.
He says "No Mummy do it!"
Sometimes he means: "No, Mummy do it" [ie not Daddy, not Clara]
Sometimes he means: "No Mummy do it" [ie I'll do it myself]
This is occasioning some serious communication glitches.