Agatha All Along Episode 4 Ending Explained

Rio Made It Clear That Teen Is Not Agatha’s Son

Up to now, what happened to Agatha’s son has not been revealed. People strongly believed that Teen could be the son of Agatha who is presumed to be dead. However, in episode 4, we see that Rio tells Agatha “That boy isn’t yours” which directly refers to Agatha starting to wonder if Teen is her long-lost son.
Since the first episode, Agatha has been hiding her protective nature towards the boy but in this episode when he gets injured, it comes to the forefront and Rio tells Agatha that he is not her son.
However, as of now, there is no evidence regarding how true her statement is. There is a possibility that Rio could be lying to torment Agatha since she wishes her to die and hence wants to inflict as much pain on her as she can.
Teen is likely the son of Wanda Maximoff. In Marvel comics, his name is Wiccan or Billy Maximoff. While Wanda is presumed to be dead in the series, Billy could be playing the part to exact revenge for her mother’s death. There are also hints and theories revolving around Rio Vadal being Lady Death but that has also not been confirmed.