run that command and you will see a pretty tree being drawn to your terminal. reading through the output will show you the commands, their arguments, what process is the parent, and if the user changed. This command has yet to fail me in determining process ownership.
grab the PID of the process that is in question using either 'pidof' or just copying it out of 'ps aux'. Once you have the PID, cat the file above (while replacing "PID" with the copied PID) and it will output the enherited environment variables of the process, which includes the "SUDO_USER=jim" variable.