I read the documentations and found this
https://docs.modx.com/revolution/2.x/making-sites-with-modx/customizing-content/template-variables/creating-a-multi-select-box-for-related-pages-in-your-template.
I need this but for different contexts. In one context (German) is the id 2, but in other context (English) it's 43.
In this case I have more than one parents. And in German context I just want the German resources and in English I just want the English resources.
Any ideas?