The Mummy test

I was out walking with my 4-year-old daughter. She picked up something off the ground and started to put it in her mouth.
I took the item away from her and I asked her not to do that. "Why?" my daughter asked. "Because it's been on the ground, you don't know where it's been, it's dirty and probably has germs" I replied.
At this point, my daughter looked at me with total admiration and asked, "Mummy, how do you know all this stuff?"
"Uh," I was thinking quickly. "All mums know this stuff. It's on the Mummy Test. You have to know it, or they don't let you be a Mummy." We walked along in silence for 2 or 3 minutes, but she was evidently pondering this new information.
"OH... I get it!" she beamed, "So if you don't pass the test you have to be the daddy."

"Exactly" I replied with a big smile on my face.