Poor grammar really bothers me. Spelling mistakes also piss me off.
We all slip up, but if you are going to write something, take the time to edit and spell check it- especially if what you write is a huge sign you are going to hold in front of the media while mourning the death of your sister/mother/friend (as pictured below in an image I scanned from The Toronto Star).
Ladies, grief isn't an excuse for poor grammar. Your sign should read:
"Jessica, you're our hero. Rest in peace sweet angel. You're safe in God's hands."