How to display only child category post in related posts in custom post type?

Please follow the below steps.

— Get the list of the parent term by using the below function
get_term_parents_list
for documentation of the function => https://developer.wordpress.org/reference/functions/get_term_parents_list/

— Get the ids of the posts that belongs to the parent taxonomy.
— Use post__not_in() function in the query to remove the posts belongs to parent taxonomy.

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