AllOf in SwaggerCodeGen

[SonamNagdev]

I have a parent class and two subclasses. I don't have a discriminator property and I am using a CustomDeserializer to return the appropriate subtype. Now with swagger codegen as I need extends keyword for the subclasses I added "allOf" over my child classes but this results in duplicate properties in child classes. I don't want to manually remove these duplicate properties from swagger json file before code generation. Anything else I can do to achieve this to prevent properties duplication in child classes?