iPad sending to iPhone via iMessage My iPad will not send an iMessage to 3 of my contacts.  I have been iMessaging with them for years, they are family and all have iPhones and haven't changed anything with their carriers, usage, etc.  All of a sudden I got the Not Delivered Message.  Can anyone help me figure this out?
It's hard to figure out what's the actual problem without more information or being at the scene. Some simple fixes you may try:


Restart your iPad.
Make sure you are not in airplane mode.
Make sure you have interact connection. You can test by browsing a webpage.
Go to 'Contact's and double check if their phone numbers (including country code) and/or apple id emails are correct.
Test whether you can message others. If so, it might be your family's side's issue.