Question about Custom post type.

I has custom field ‘People’ and I have parent pages(post types) and child pages (post types). This is my code.
I need display this custom post types in hierarchical order. For example:

First parent post type
– first child of first parent post type
-second child of first parent post type
Second parent post type
-first child of second parent post type
But by default this posts displayed in other order… Any ideas, how resolved this problem?

Thanks all.