The get_footer() API call from a template file would access the child theme footer. If you look at just about any of the template files (except for header.php), you'll see this API Call.
In other words, if you place a footer.php in your child theme file the templates would execute that instead of the main/parent theme footer.php.
So, let's say I wanted to add something to the options.php file from parent folder. I would copy and paste it into the child-theme folder and then add what I want into that options.php...would it work the same as the footer.php?? Meaning, would the template look for the options.php in my child-theme folder first??