[Resolved] problem query related child post in the same parent

[Author]

Posts

[viktorI]

I am trying to:

let say i have parent post, name [vendor]
and then [vendor] have a child post hotel A, hotel B, hotel C.

When i query Hotel A in single page and then below that page, showing about related child post for ex : hotel B , hotel C

which that related child should in same parent.

and i cannot achive this, i already try from wp types documentation but no luck untill now, always showing no item found

Link to a page where the issue can be seen:
hidden link

I expected to see:
i expected to see the related child post in same parent

Instead, I got:

No items found

[Luo Yang]

Hi,

I assume the post type "vendor" is a hierarchical custom post type, and you are going to display it's brother posts in a single "vendor" post, please follow our document to setup the view:
Displaying Brother Pages
https://toolset.com/documentation/user-guides/displaying-brother-pages/