Elias may represent a part of yourself, such as specific feelings or memories or beliefs. You want to introduce him to your parents. Note that he is very vulnerable (naked) and you wish to clothe and reassure him. But there seems to be some issue around your mother... you need to get defensive and protect him (telling him to get dressed) and this protector part gets angry at your mother when she comes into contact with him (Elias' mother throwing yours down the stairs).