I Want to Sing

There was a boy called Sinyo who was very naughty. Everytime there's a family meeting, or ladies meeting in their house this boy always screaming "Mom! I want to piss..!!" This habit is realy bothering his mother, so his mother set a plan to 'change' this habit.
Mother: "Sinyo, if you want to piss, don't scream mom, l want to piss. Just said mom I want to sing. OK?
Sinyo: "OK, mom..''
Since then, the boy change his habit and never forget it..!! Two months later during holiday, Sinyo went to his granny's house in the village to spent the holiday for a month. Then one night Sinyo wake up and need to use the restroom
Sinyo: "Granny, I want to sing..!!"
Granny: "Sinyo, it's late already. You can sing tomorrow, now go to sleep!"
Sinyo: "But Granny, if i didn't sing, I can't sleep.."
Granny: "Alright then. You can sing in my ear, but don't too much loud OK?"
Sinyo: "Not too much loud, got it..!!"
Then slowly Sinyo 'sing not to much loud'
Granny: "...???!!!"