Hi Nanny,
I wouldn't worry about it. I don't think they are accusing you etc. if you feel that way just ask them why?
I installed them because I had a horrible childhood experience with babysitters and deep deep down I have issues. Now, we love you and appreciate everything you do and consider you family and wouldn't want anybody else but you with our precious little one. It's more for me, to turn on in the middle of the day during my break and see how happy my little one is with you. It gives me peace. It also makes me appreciate you that much more!
I hope you understand and someday if and when you want or have kids, I hope you'll understand that much more.
Again thanks for all that you do!