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dequeuing and enqueuing minified js files in childtheme wordpress

I'm trying to dequeue a minified js file from wordpress parent theme.
Can't seem to work out how to dequeue and then enqueue my own custom js file from child theme.
Here is my code:
add_action( 'wp_enqueue_scripts', 'my_remove_scripts', 20 );
function my_remove_scripts(){
wp_dequeue_script( 'custom' );
}
add_action('wp_enqueue_scripts', 'my_add_scripts');
function my_add_scripts(){
wp_enqueue_script('custom-child', get_template_directory_uri() . '/js/custom'.$js_minify_prefix.'.js', array('jquery'), THEME_VERSION, true);
}
The script in the parent theme is enqueued like this:
wp_enqueue_script('custom', get_template_directory_uri() . '/js/custom'.$js_minify_prefix.'.js', array('jquery'), THEME_VERSION, true);
Is there something I'm missing in the code or is there a special way of dequeueing/enqueueing minified scripts?
Any help would be appreciated!! :)

There is just one mistake in your code. You are dequeuing and then enqueuing the same file.
Use this code:
add_action( 'wp_enqueue_scripts', 'my_remove_scripts', 20 );
function my_remove_scripts(){
wp_dequeue_script( 'custom' );
}
add_action('wp_enqueue_scripts', 'my_add_scripts');
function my_add_scripts(){
wp_enqueue_script('custom-child', get_stylesheet_directory_uri() . '/js/custom.min.js', array('jquery'), 1.0, true);
}
get_stylesheet_directory_uri() is the key here. It returns the path of the child theme. Also, I have removed the $js_minify_prefix variable from the code as it is not required.

Can't load js file into child theme for Wordpress

I'm trying to load a custom js file into a child theme. I have set up a folder within the child themes directory on FTP that contains a js file, but it does not work. Below is my code i used to enque the file.
<?php
function theme_name_scripts() {
wp_enqueue_script('myscript', /js/public.js);
}
add_action( 'wp_enqueue_scripts', 'theme_name_scripts' );
?>

Replace
wp_enqueue_script('myscript', /js/public.js);
With
wp_enqueue_script('myscript', '/js/public.js');

if you want to load js file into child theme for Wordpress your code should like this.
<?php
add_action( 'wp_enqueue_scripts', 'theme_name_scripts' );
function theme_name_scripts() {
wp_enqueue_script( 'myscript', get_template_directory_uri() . '/js/public.js', array( 'jquery' ), '1.0', true);
}
?>

Wordpress functions.php file not working

I want to add all my themes JavaScript files in function.php and my scripts are
<script src="http://localhost/xampp/website/nextgen/wp-content/themes/nextgen/nextgen/js/jquery.min.js"></script>
how can i add these to my functions.php i have tried several tutorials but it not work for me.
Show me demo with the above code

Place this in functions.php file:
function addthemejs() {
wp_enqueue_script( 'myscript', 'http://localhost/xampp/website/nextgen/wp-content/themes/nextgen/nextgen/js/jquery.min.js' , array(), "", false ); );
}
add_action( 'wp_enqueue_scripts' , 'addthemejs' );
I have hardcoded your code, you have to know that is not so good solution, but if you are just testing it's ok I guess

Twitter bootstrap. bootstrap javascript is working but others script wont

I was wondering why my other scripts wont work but the bootstrap.js is working. I have here my code for my functions.php on calling the scripts.
<?php
/*Linking of CSS Child Theme to Parent Theme + JavaScript*/
function theme_add_bootstrap()
{
wp_enqueue_style( 'bootstrap-css', get_template_directory_uri() . '/css/bootstrap.css' );
wp_enqueue_style( 'custom-css', get_template_directory_uri() . '/css/custom.css' ); <!--Working Javascript -->
wp_enqueue_script( 'bootstrap-js', get_stylesheet_directory_uri().'/js/bootstrap.js', array( 'jquery' ) );
wp_enqueue_script( 'custom-js', get_stylesheet_directory_uri().'/js/custom.js', array( 'jquery' ) );
wp_enqueue_script( 'jquery-easy-min-js', get_stylesheet_directory_uri().'/js/jquery.easy.min.js', array( 'jquery' ) );
wp_enqueue_script( 'jquery-1-js', get_stylesheet_directory_uri().'/js/jquery-1.11.0.js', array( 'jquery' ) );
}
add_action( 'wp_enqueue_scripts', 'theme_add_bootstrap' );
The other 3 scripts (custom.js , jquery.easy.min.js, and jquery-1.11.0.js) are working fine in LOCALHOST. however when I uploaded my wordpress site. this scripts are no longer functioning. can someone help with this? by the way this 3 scripts are for PAGE SCROLLING.

Maybe you misspelled 'jquery' as 'jqeury'?
wp_enqueue_script( 'jquery-1-js', get_stylesheet_directory_uri().'/js/jqeury-1.11.0.js', array( 'jquery' ) );
But if that wasn't misspelled, then maybe you're loading jQuery twice, because jqeury-1.11.0.js looks like jQuery itself. In that case, get rid of this line. Wordpress has it's own jQuery, which you loaded the first time you put array('jquery') as a dependency in a wp_enqueue_script statement.

Add jQuery before bootstrap. Bootstrap depends on it

I think you have to place jquery at the top of scripts so it will work fine

I need to change order of scripts in footer of my wordpress site so my custom main.js file loads last of all scripts

This is how I call my custom script in functions.php my child theme:
<?php
/*Functions file for child theme*/
define( 'OPTIONS_FRAMEWORK_DIRECTORY', get_stylesheet_directory_uri() . '/inc/' );
require_once dirname( __FILE__ ) . '/inc/options-framework.php';
function mychildtheme_setup() {
show_admin_bar(false);
wp_register_script( 'main', get_stylesheet_directory_uri() . '/js/main.js', array('jquery'), false, true);
wp_enqueue_script( 'main' );
}
add_action('after_setup_theme', 'mychildtheme_setup');
add_action( 'wp_enqueue_scripts', 'mychildtheme_setup', 10000 );
?>
But when I look in source code I see that my main.js loads before contact-form.js and I want my main.js script loads after that one.
How can I change the order so my script loads last of all scripts?

Need answer still?Similar question has been answered here: https://wordpress.stackexchange.com/questions/114473/wp-enqueue-script-how-to-change-loading-order-of-scripts.
Keyword is $deps.