What Daddies/Mommies do Best by Laura Numeroff, illustrated by Lynn Munsinger

From chapters.ca:
This charming book, really two books back- to- back, shows preschoolers that mothers and fathers are equally important and equally special. Five different animal pairs demonstrate the skills that mothers possess - turn the book over and children see fathers doing the same things, in their own way. Children from any kind of family will be able to relate to the familiar domestic scenes portrayed with plenty of whimsy and warmth.