MVC :: Model Not Validating Correctly In Controller. Optional Property With Required Children Fields

Basically I have RegisterModel2 that has a Person class. My requirement is that Phone Number and Address are not required for registration. But if they try to enter a Phone number of Address then it should validate it. Problem is that it is always stating that the child fields of Phone (area code, number) and child fields of Address (street1,city,etc) are required. Is there a way to annotate in the RegisterModel that a parent class is not Required but if any data in a child element is given then and only
then should the child elements be validated?

My Person EDM class has a nullable 0.1 -> 0.1 navigation property to Phone and Address.Here is the person class

[MetadataType(typeof(Person_Validation))]
public partial class Person
{
}

public class Person_Validation [code]....

The Person EntityObject has an optional/nullable Navigation Property to the Phone Object.


The Phone object has these annotations,[Code]....

I have RegisterModel defined as follows:
[Code]....

My View looks like this:
[Code]....

And here is my Controller Action it is posting to:
[Code]....