Wait, "amma magan patti" could also mean a mother and son as a pair or a generation. Maybe the story is about the mother and son's relationship, perhaps the mother having a love story with her son's father, or the son finding love while learning from his mother. But a love story between mother and son would be problematic. Maybe the user meant a story involving a mother and son where the son is in a love story. Alternatively, maybe it's a typo for "amma magan kathai", which would be a story about a mother and son.