The phrase "sure parents" refers to being confident or certain about someone's ability to be good parents.
Sentences with «sure parents»
If your school has already started to improve their offerings, make sure parents know about it. (thelunchtray.com)
If not, I make sure the parent knows why I think it was the best course of action and that I value their child enough to follow through. (edutopia.org)
But I'm sure parents of food - allergic kids share all the concerns you mention. (thelunchtray.com)