sigh

Dear Mother-in-law,
Thanks for feeding my (previously untested) child shrimp while babysitting him last week.  Thanks for (not) checking with us about the menu change, even though you were there when I went over every detail of your take out selections with you and said they were all ok (except for limited amounts of the sweet & sour sauce because of the red dye added). 
You should be very thankful that he did not have a reaction of any sort to it.  I probably wouldn't have ever forgiven you for that.  Well, maybe I'd forgive you eventually, but there would be no way you'd get to babysit him in the near future over a meal time!
As it is, you're going to get specific instructions for food from now on!  Oh, and thanks for not cutting up his food either ... a nice choking hazard as well as now we have a fight to cut up his food now!
Your very unhappy Daughter-in-law.