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your question falls into the category of region interaction. Here are your choices
Option 1. The task flows use a shared Datacontrol setting. In this case a PPR of a dependent region shows the data change
Opion 2. Task flows cannot use PPR directly (e.g. the fragments are in sibling regions) : In this case you can work with bean dependency injection: Create a managed bean in viewScope in the parent task flow definition. Pass a reference to the managed bean to the task flows as input parameters (both task flows will need to have a input parameter defined that takes a reference to this bean and safes it in a task fow page flow scope bean). This way both regions can call out o the parent taskflow, which now has control to refresh (PPR) a dependent region.
Option 3. Contextual events: See http://docs.oracle.com/cd/E23943_01/web.1111/b31974/web_adv.htm#CACJBFGI