I think it’s from the 90s. A guy knocks in this woman’s door and convinces her that he is her abandoned son. The woman, who lives with her husband and daughter, believes him. He says he’s a student and looking for a room to which the fake mom offers him a blue room in her house to stay in. Later he kills the husband inside the house with some untraceable poised. After a while the crazy guys girlfriend comes in the picture and gets angry because he gave her (angel) necklace to his fake mom. She threatens to shoot the daughter of the fake mom doesn’t go to the bank with him to withdrawal a lot of money for the couple to steal. Later the fake mom finds out her real abandoned son was in jail and the criminal stole his identity. Something like that. Anyone know this movie?
The Stranger Within (1990)?