Transfer string using shared object from one flash file

There are four .fla files by name main.fla, child1.fla, child2.fla, child3.fla.
This main.fla contains one input text field, after entering text into it and
by clicking next button , we will go to last frame of the main.fla file. In the
last frame of the main.fla, 3 buttons are provided each corresponds to one
child flash file.
In this main.fla file, I used shared objects concept as follows:
so = SharedObject.getLocal("flashdata", "/")
so.data.name = sending_txt.text; /* sending_txt is input text field instance
name */

In this child1.fla file, I used shared objects concept as follows:
so = SharedObject.getLocal("flashdata", "/")
receiving_txt1.text = so.data.name; /* receiving_txt1 is dynamic text field
instnace name */
A button is provided in child1.fla. On clicking which brings back to
the last frame of the main.fla file.

Likewise, receiving_txt2 is dynamic text field instnace name in child2.fla &
receiving_txt3 is dynamic text field instnace name in child3.fla. My objective
is:

When we come back to last frame of main.fla, and clicks buttons corresponding
to the remaining two child flas, the content of receiving_txt1(text what we
entered in input text field) should appear in receiving_txt2 of child2.fla and
receiving_txt3 of child3.fla.