I see, I thought it was just one person that wanted a particular notification.
Still in the meantime you can disable the notifications for all phones and use the code in this link: Send text messages to multiple cell numbers? - #3 by douglasl
This way you can just enter the phone numbers for the people that want a particular alert.
I’ve been wanting to do this for a while now but haven’t had time. However i’m doing it for a different reason, I’m interested in doing this so I can have different alerts sounds via custom text message ringtone (this way I can have a siren play on all connected phones if an intrusion is detected)…