I know what I should do but just want reassurance that I'm right please. 
I'm a live in nanny for a family who are on holiday atm. The cleaner's been in this morning and done a real half arsed job which annoyed me as it is.
But I also suspect her of stealing food from the family and want to check that I should tell the family.
It's half empty and some full things from the cupboard that she's cleaned out. All in a bag and hidden in the cleaning cupboard..
I took a photo as I'm assuming she's planning on taking them when I'm not around. I need to tell the family don't I?