APEX

I have an htlml form region with fields for update of some database columns.
I also have a list of children in the form of a report at the bottom of the page.
These children each have an edit button that will navigate to another form page for edtiting their details.
When I am done editing the child, I want to navigate back to the original page (parent) without changing any of the displayed values on the parent. So if I type in a change on the parent, but don't save it (yet), then navigate to a child - either save or cancel there, I still want to see the unsaved changes on the parent, but I would also want to see values that have changed in the childrens row on the parent page.

As it is, when ever I navigate back to the parent form, it requeries and the unsaved changes are lost.

btw, I am not using automatic row processing on either page.
How can I easily do this?