This film tells the story of a white male meeting his late boyfriend's mother for the first time. This is complicated by the fact that the boyfriend's mother is Cambodian Chinese, and does not speak any English. With the help of a translator, they get through the language barrier - but not the cultural barrier.
"Lilting" is an ambitious attempt to portray the cultural differences at play in a modern relationship. The story places a lot of emphasis on the filial duties of a Chinese child, and the anger of the mother whose son does not fulfill the supposed filial duties. This is surely mystifying to Western viewers, and the film does not really explain it that clearly. As I do understand this cultural context, I empathise with the story.
Two things that bug me though, is that Kai looks so Caucasian. I have huge trouble in believing that he is only a quarter English. The second thing is that the mother says he feels lonely during Christmas, which is clearly a line aimed at Western viewers because she would the most likely not be celebrating Christmas. She would be way more likely to feel lonely during Chinese New Year.
Overall, "Lilting" is not for everyone. The pacing is slow, but if you understand the cultural subtext then you will empathise with the story a lot.