What order are signals sent to a process group in Linux?

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If I ctrl-c a program at the terminal, Linux will send a SIGTERM to all members of the process group. Is the order each process recieves the signal well defined?

Eg: if I have a process tree something like this (<-- denotes [parent] <-- [child])

[PID 2] <-- [PID 3] <-- [PID 4]
                     \_ [PID 5]
                      |_[PID 6]

Will pids 4,5,6 receive the signal first, sending a SIGCHLD To pid 3? And then pid 3 and pid 2?

linux
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