The love between Ruku and Selvam goes beyond that of mother and son. It’s not just obedience or familial obligation that bonds them, but a real understanding of each other. This sheds some light on Selvam as a son, especially as he’s different from his brothers. Ruku admits that she doesn’t know him completely (like Ira does), but at least he sticks around. By contrast, her other sons, (whom she didn’t know completely either) took this isolation from her as a good excuse to abandon the family. Selvam, though he has grown beyond the family, still stays with his parents out of love. The kind of understanding exhibited here is good proof that not just obligation, but real love, is what makes his relationship with Ruku work.