I said student said

I have a student that is telling his parents he is doing all his late work, missing work, and test retakes when he is not. He is straight up lying to them. I called them today to talk about how I haven’t received anything. I also talked to him and he’s lying to my face about all the retakes he’s done. She said that he lies a lot but she’s trying to believe him because he’s promising he is not lying. I have a meeting scheduled tomorrow to get to the bottom of it and “hear both sides” what do I do here?