I know this has been said by others, but I just had to put in my 2 cents -- my biggest issue would be the deception. My mil is very similar -- she has been sneaky on too many occassions for me to feel safe with ds in her care for too long. In fact, I have done everything to avoid a situation where she would drive him because I know this very issue could come up. I am sorry I don't have any solid advice, but if possible, maybe finding someone else to care for your dc is a good idea.