Maybe you should try reading them this book.
From the publisher’s site:
Go the Fuck to Sleep is a bedtime book for parents who live in the real world, where a few snoozing kitties and cutesy rhymes don’t always send a toddler sailing blissfully off to dreamland. Profane, affectionate, and radically honest, California Book Award-winning author Adam Mansbach’s verses perfectly capture the familiar–and unspoken–tribulations of putting your little angel down for the night. In the process, they open up a conversation about parenting, granting us permission to admit our frustrations, and laugh at their absurdity.
With illustrations by Ricardo Cortes, Go the Fuck to Sleep is beautiful, subversive, and pants-wettingly funny–a book for parents new, old, and expectant. You probably should not read it to your children.