Win32: Who called the program?

Question

Windows

There is a program. 64-bit.
It calls the second program through CreateProcess - a 32-bit proxy. He receives data from the accounting system and begins to drive the information back, simply through the console.
Both are under my control, but one is only 64 due to memory sizes, the other is only 32 due to architecture.
The accounting system checks who ran it, and of course it sees a 32-bit proxy. He's fine, he's signed.
How to do a similar check in our 32-bit program?

Answer 1

determine the parent process windows
ps for example for C# in the same output