Which mom, which kitten?

The owner was away working for long periods, leaving the mother cat at home to raise her kittens. When he returned, he couldn’t tell which kitten and which mom cat.
He asked both, which once mom and which one kitten?
Mom cat even poked her face out so he could see her clearly, but he still didn’t understand.
Mom cat, quick-witted, went back into the nest and gave her kitten a few taps. He immediately understood which one mom and which one kitten 
Kitten: 。。。
Here’s our interesting video in the comments. Have you figured out which mom and which kitten? Let me know in the comments!
