"'S a' yer fault ah'm here," she moaned. "'S no' fair."
"Yous is aye cliping," he grumped. "If it wisnae fur yous, we'd neither o' us be here. Twenty minutes! Naw, s'no fair right enough."
Meanwhile, Maw was in the kitchen making dinner. "Quiet, yous twa!" she yelled. "D'ye's want some mair?"
The bairns replied in chorus that "it wisnae fair, it wis the other yin's fault." That did it, twenty minutes more. They protested, but Maw was unmoved. The cat wasn't impressed, either.