[resending to list]
Depending on your exact use case, this might help: Have an option to
ssh that causes it to print the PID of the user process on the remote
computer.
IIF you use session multiplexing, you can open another shell via the
same SSH process and easily get the "other" child process (the sibling)
via "pgrep -P $$": that asks for processes with the same parent PID.
Be careful to quote '$$' so that it's interpolated on the remote side
only.
Even easier would be 'pkill -P $$', of course...
If you can't use session multiplexing, you might be able to find the
interesting process via the other arguments to pgrep/pkill - like "-U",
and/or specifying "-P $(pidof sshd)", etc.
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