Display a Field based on another Field

I have the following situation.

• I created two custom checkboxes and two custom text fields.
• Both checkboxes have the values of Yes, No, and Unknown.
• The two checkboxes are required
• The two text fields are hidden
• If the user clicks Yes for either or both checkboxes, an associated text field should be displayed underneath the checkbox and it has be be required.
• If the user later clicks No or Unknown for either or both checkboxes, the associated text field should be hidden and not be required.

Layout
Checkbox1
Text field1
Checkbox2
Text field2