How to access "child" values from "Parent" SharePoint fields

Checkbox field: If I have 2 (or more) checkbox values for ONE "Parent" Checkbox SharePoint field, how do I access the values of the various "child" checkbox values so that I can make the form perform certain actions depending on which checkbox (or more) are checked?
Date AND Time field: The SharePoint Date and Time field populates with THREE values: Date, Hour, and Minute. How do I access the "Hour" field and the "Minute" field so that I can pre-populate those boxes with the current hour and minute?
Radio button: If I have a Radio button SharePoint field, how do I access the multiple choices a user can make on the single Radio box?

dynamically

var checkboxIndex = 2; //You are setting an absolute index value here; this code will not work if the user selects a value other than 2.
fd.field('MultiChoice').control()._el()
  .find('input[type="checkbox"]').eq(checkboxIndex)//Again, this only checks if checkbox value is = 2.  What about 0, 1, 3, etc.?
  .is(':checked');
fd.field('MultiChoice').change(function(){
  alert('Field changed!');//This checks if the FIELD changes, but I still can not retrieve the value.
});
//When the field changes, I want to be able to change the form dynamically, depending on if they chose Choice 1, Choice 2, Choice 1 AND 2, etc.
//You are setting an absolute index value here; this code will not work if the user selects a value other than 2.
//Again, this only checks if checkbox value is = 2.  What about 0, 1, 3, etc.?

//This checks if the FIELD changes, but I still can not retrieve the value.

//When the field changes, I want to be able to change the form dynamically, depending on
fd.field('MultiChoice').value()
if ($.inArray(0, fd.field('MultiChoice').value())) {
  alert('The first option is selected!');
}

if ($.inArray(1, fd.field('MultiChoice').value())) {
  alert('The second option is selected!');
}

How to access "child" values from "Parent" SharePoint fields

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