When answering awkward questions for our two children, it has proven useful, being keepers of pigs.
A few days ago, Smudge (aged 8) asked the big question in the car - how are babies made? Both his dad and his older sister told him Mummy could answer that. Mummy wasn't there, so Smudge had to carry on to school in ignorance that day.
He asked again at bedtime when Mummy, a reliable source of accurate and well-explained information on many topics, was available.