This reminds me of one Thanksgiving, the last one my parents let my grandma cook for. We showed up around 8:00 am to help her cook, and she informed us that we don't have to worry about the turkey, because she got up early and put it in the oven...at 4:00. We typically eat those holiday meals at 1:00, so that turkey was more than a bit on the dry side. It wasn't quite like the Griswold Christmas turkey, but we did go through more gravy than usual.
I took over cooking at Thanksgiving last your at the MIL's because I was bored making chit chat. I asked where her thermometer was to check the turkey. She didn't own one. She had always just looked at it to know when it was done. Which really meant that she over cooked it enough to be safe. It was at that moment that I decided that she would never ever cook for me again.