Calling More than One Child Package(Multiple Child Packages) using Script task Without using Execute Package Task in Master package

Hi All

I have a Master Package and Two Child Packages Totally 3 packages,

I want to call that two Child packages using script task without using Execute Package Task.

Info:-  package location is in C:\Temp\

Temp folder Contains 3 dtsx packages 1)master 2) Child 3)Sub Child.

Pls do Reply to my question same i have to implement in my package

Thanks

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supreeth