[API] Get the parent image and all of its children in one API call

I'm currently working on a discord bot that will fetch images from the site, and if the returned image is a parent image, i want to get all of the children images. Due to some system restrictions if i want to return a such list i need to have all of the concerned images on a same json document. Is it possible ?

Any help will be welcomed

You're looking for the parent metatag. See help:cheatsheet for the full list.

Thanks. How do i implement it in a request ?

I tried https://danbooru.donmai.us/posts.json?tags=futanari%20animal_ears&parent:3120056

But the requests does

It's not & nor is it %20, it's +...

https://danbooru.donmai.us/posts.json?tags=futanari+animal_ears+parent:3120056