{
    "snapshot_mode": "current_open",
    "employee": {}, // omitted for brevity
    "dependents": [], // omitted for brevity
    "coverages": [
        {
            "carrier_id": "2d370e0e-fd73-45e0-8828-796d2cacaeef",
            "line_of_coverage": "dental",
            "plan_id": "84a6c0a6-4ae9-484b-ab8d-af1ab6551efe",
            "enrolled_members": [
                {
                    "custom_individual_id": "150D001",
                    "individual_type": "employee",
                    "event_id": "10002",
                    "effective_start_date": "2023-04-01",
                    "effective_end_date": "2023-03-31",
                    "latest_change_effective_date": "2023-03-20"
                },
                {
                    "custom_individual_id": "150D0C2",
                    "individual_type": "dependent",
                    "event_id": "10002",
                    "effective_start_date": "2023-04-01",
                    "effective_end_date": "2023-03-31",
                    "latest_change_effective_date": "2023-03-20"
                }

            ]
        }
    ],
    "events": [
        {
            "id": "10002",
            "date": "2023-03-20",
            "type": "coverage",
            "reason": "offline_change"
        }
    ]
}

{
    "snapshot_mode": "current_open",
    "employee": {}, // omitted for brevity
    "dependents": [], // omitted for brevity
    "coverages": [
        {
            "carrier_id": "2d370e0e-fd73-45e0-8828-796d2cacaeef",
            "line_of_coverage": "dental",
            "plan_id": "84a6c0a6-4ae9-484b-ab8d-af1ab6551efe",
            "enrolled_members": [
                {
                    "custom_individual_id": "150D001",
                    "individual_type": "employee",
                    "event_id": "10002",
                    "effective_start_date": "2023-04-01",
                    "effective_end_date": "2023-03-31",
                    "latest_change_effective_date": "2023-03-20"
                },
                {
                    "custom_individual_id": "150D0C2",
                    "individual_type": "dependent",
                    "event_id": "10002",
                    "effective_start_date": "2023-04-01",
                    "effective_end_date": "2023-03-31",
                    "latest_change_effective_date": "2023-03-20"
                }

            ]
        }
    ],
    "events": [
        {
            "id": "10002",
            "date": "2023-03-20",
            "type": "coverage",
            "reason": "offline_change"
        }
    ]
}
1

Current state

Note the current state of the member and family before waiving or canceling. All coverages are active, with max end dates of 9999-12-31.The current state of a family can be retrieved in the form of a member snapshot via the GET Member Snapshot by Employee ID endpoint.
2

Set effective dates

To waive/cancel coverage, set the effective_end_date to one day before the effective_start_date.