JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.aspnetcdn.com/ajax/knockout/knockout-2.2.1.js"></script>
<p>Total <span data-bind="text: dependent().length">&nbsp;</span> dependents(s)</p>

JavaScript

var initialData =  [{"RelationshipManager":{},"Id":1,"Name":"Tall Hat","Age":10},{"RelationshipManager":{},"Id":2,"Name":"Long Cloak","Age":12}]

var viewModel = {
    dependent: ko.observableArray(initialData)
};

$(document).ready(function () { ko.applyBindings(viewModel); });