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Thanks for the response Julius.  I have used that before when the property came in the JSON consistently in the same format.  In this case it can come in as: 

"members": null,

or as:

"members": [
                    "dob": "1905-05-01",
                    "firstName": "BOB",
                    "middleName": "T",
                    "nameSuffix": "",
                    "genderCode": "M",
                    "lastName": "COLLINS",
                    "memberId": "123421741",
                    "relationship": "Subscriber"

Not sure this way will accommodate the two possible structures.

I am still getting "ERROR #9406: Unexpected format for value of field, members, using class base mapping".

Is there anything else that needs to be set along with the %DynamicArray?  I also tried %DynamicObject as well.

Property members As %DynamicArray; Property relationship As %String; Storage Default
<Data name="members">

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