HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>parent .is('form')</title>
  <style>
    div { color: red; margin: 8px 0; }
  </style>
</head>
<body>
  <form id="in-form">
    <label><input type="checkbox"> In form</label>
  </form>
  <p id="in-para">
    <label><input type="checkbox"> In paragraph</label>
  </p>
  <div id="result"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var inForm = $("#in-form input").parent().is("form");
    var inPara = $("#in-para input").parent().is("form");
    $("#result").html(
      "inForm = " + inForm + "<br>inPara = " + inPara
    );
  </script>
</body>
</html>

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