For me, the special event in Tanjong Rhu story is when Mr. Li showed his mother his newly-bought binocular. He wanted to show her the view from his office. Being someone with a very bad eyesight, Ah Ma decided against it. But after being convinced by Mr. Li, Ah Ma still went to his office and looked through the binocular. 
This event is special for me because this certainly shows that no matter how old we are, we are still a child when we are in front of our parents.