Hey Suzi~
That was kinda funny sitting here reading what you wrote,cuz I use to have an in home daycare till I had 5 of my own to care for, and I really feel for you right now cuz I would always get parents doing ritual things too that would really get to me sometimes. I use to have a mom, for instance, that would drop off her child and every time she would enter into my home she would "Make herself at home",which was fine-I was just having a prob. w/ it, and just wander throughout the house and open the refrigerator to put her childs cup into it and walk into bedrooms follwing her child....etc. and the only way I found to release the frustration that I was having w/ the matter was to "re-vise" my contract(which did not happen often) that I had w/ all my family's that I cared for, and state in it that the pick-up and drop-off area was in the front living room ONLY- But any time that I would get another parent doing something that got to me, I would re-vise my contract and put whatever it was that they were doing in there, give it to them and I would point out a few of the revisions, including the one that I was getting stressed out with, and then have them sign it again.
I do want to add that if you never let them know that it is bothering you, they will NEVER stop and then you will start to become irked with even more things that they start to do over time and then ultimately despise watching their children. You have already stated that this is a wonderful family, but you need to tell them the problem that you yourself are having with the phone calls, just be creative with how you tell them.
Hope this was of some help to ya~
A.