One sign of reassurance can do many things to a human. I do not mind being a 'pat on the back'.

But I suppose. I do not see what relevancy it will have, though. Humans can be stubborn, and even though I could tell them about it, it would not carry the same, hrm, impact as showing them would be. They will do as they will.

...although...

I have photographs. That could possibly work...