How to input relative job with nested process chain

I have a process chain with 3 parallel chains for Step 1. I am trying to consolidate the process files of all 3 process chains to be sent to System_Mail_Send. The structure of my process chain is as follows:

PC_Parent

Step 1

PC_Child1

Step 1

Step 2

PC_Child2

Step1

Step 2

Step 2

What do I put in RelativeJob parameter in System_Mail_Send if I need to get process files from Step 2 of both PC_Child1 and PC_Child 2?

I tried the ff but I'm encountering an error:

N1.txt=Step 1, Job 1, Step 2, Job 1:*

N2.txt=Step 1, Job 2, Step 2, Job 1:*