Bad Family and Lie Detector Robot

A man buys a lie detective robot dat slaps anybody dat lies and decides to test it during dinner. After his wife had served dinner, they sat down together with their son and started eating. The man then asked his son, "Junior where did u go to today?" and Junior replied, "i went to school dad." Immediately, the robot gave Junior a solid slap. His dad repeated the question and Junior replied, "i went to a friend's house and we were watching movies."
"What kind of movies?" his father asked and Junior replied, "we were watching The Terminator series." Again, the robot gave Junior another good slap and Junior quickly said, "it was a porn movie dad!"
His father was happy dat the robot was doing its job and then he said, "What? A porn movie? When i was ur age we used to watch Tom & Jerry cartoon. I didn't even know what porn was." Without wasting anytime, the robot landed the father a solid slap.
The mum who had been watching silently with so much interest gave out a big laugh and said, "he is definitely ur son." The robot turn towards the mum and hammered her a thunderous slap:#  Na who lie pass?