Write an expression in 'visibleIf' to show/hide your question(s)
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clearInvisibleValues : Clear values for invsible questions on survey complete, default is false.

survey.clearInvisibleValues = yourValue; survey.render();


Survey.Survey.cssType = "bootstrap";
Survey.defaultBootstrapCss.navigationButton = "btn btn-green";

window.survey = new Survey.Model({ showQuestionNumbers: "off",
     questions: [
    { type: "radiogroup", name: "haveKids", title: "Do you have a kid(s)?", isRequired: true, choices:["Yes", "No"], colCount: 0},
    { type: "dropdown", name: "kids", title: "How many kids do you have", visibleIf: "{haveKids}='Yes'",
        isRequired: true, choices:[1, 2, 3, 4, 5] }, 
    { type: "dropdown", name: "kid1Age", title: "The first kid age:", visibleIf: "{haveKids}='Yes' and {kids} >= 1",
        isRequired: true, choices:[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]},
    { type: "dropdown", name: "kid2Age", title: "The second kid age:", visibleIf: "{haveKids}='Yes' and {kids} >= 2",
        isRequired: true, startWithNewLine: false, choices:[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]},
    { type: "dropdown", name: "kid3Age", title: "The third kid age:", visibleIf: "{haveKids}='Yes' and {kids} >= 3",
        isRequired: true, startWithNewLine: false, choices:[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]},
    { type: "dropdown", name: "kid4Age", title: "The fourth kid age:", visibleIf: "{haveKids}='Yes' and {kids} >= 4",
        isRequired: true, startWithNewLine: false, choices:[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]},
    { type: "dropdown", name: "kid5Age", title: "The fifth kid age:", visibleIf: "{haveKids}='Yes' and {kids} >= 5",
        isRequired: true, startWithNewLine: false, choices:[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]}
]});
survey.onComplete.add(function(result) {
	document.querySelector('#surveyResult').innerHTML = "result: " + JSON.stringify(result.data);
});


ReactDOM.render(<Survey.Survey model={survey} />, document.getElementById("surveyElement"));


<!DOCTYPE html>
<html>

<head>
    <title>Welcome to React</title>
    <script src="https://unpkg.com/react@15/dist/react.js"></script>
    <script src="https://unpkg.com/react-dom@15/dist/react-dom.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.23/browser.js"></script>
    
    <script src="https://surveyjs.azureedge.net/0.12.19/survey.react.js"></script>
    
    
    <link rel="stylesheet" href="https://unpkg.com/bootstrap@3.3.7/dist/css/bootstrap.min.css">
    <link rel="stylesheet" href="./index.css">
</head>

<body>
    <div id="surveyElement"></div>
    <div id="surveyResult"></div>
    <script type="text/babel" src="./index.js"></script>
</body>

</html>

.btn-green {
  background-color: #1ab394;
  color: #fff;
  border-radius: 3px;
}

.btn-green:hover, .btn-green:focus {
    background-color: #18a689;
    color: #fff;
}

.panel-footer {
    text-align: right;
    background-color: #fff;
}