InfoPath Dev

I am to create the following (in stripped down version) using Infopath 2010 Forms, client or browser-enabled. 

There are 2 linked Sharepoint lists: 
ParentList ( ID, Title , Other fields, consider none)
ChildList (ID, Title, ParentIdLookup , Other fields, consider none)

A user should have an extended page for editing, deleting old items, inserting new ones of ParentList and simultaneously for related ChildList items for chosen ParentList item.

I have done this using Sharepoint Designer 2010 but have difficult times to realize or even understand how to approach this in Infopath 2010 (Filler or Designer).

What are possible approaches?
Does it make sense to do in Infopath and if not then what are arguments?

There are several techniques for how to do this such as web parts or InfoPath + qRules.  Here are a few tutorial videos that may help you out:

http://www.youtube.com/watch?v=W6l27liMxX4

http://www.youtube.com/watch?v=85b7ftTJYo8&feature=youtu.be

http://www.screencast.com/t/uV1u59TeMX