How do you test if your parent process has disabled WOW64 redirection?
If you are referring to WOW64 File System redirection, I doubt you can test if the parent process has disabled WOW64 FS Redirection.
The reason I say this is because WOW64 FS redirection not disabled at the process level but at the thread level. And a child process has no concept of the thread in the parent process that spawned it.