Wait, the user specified "install," so maybe it's about installing software. That's a common scenario these days. The son is tech-savvy, the mother is less so, and they have a funny back-and-forth. The humor could come from the mom using Sinhala words in English contexts or the son explaining in a way that's too technical for her to grasp.
(laughs): “This isn’t tea, Ama! It’s a video game!” sinhala wal katha mom and son install
(groans): “No, Ama! Not ‘put it somewhere’! It’s software—like, for the PC! I don’t wanna put it in the fridge!” Wait, the user specified "install," so maybe it's
Also, considering Sinhala culture, maybe the mother has traditional wisdom, and the son is the modern tech-savvy kid. The clash or collaboration between their approaches could be a good dynamic. the user specified "install