My MIL has taken to demanding that I cook when we stay at her house.
Last time we were there, the first night we had roast beef. She presented DH with a practically clean roasting pan, and told him to make gravy from the "delicious meat juices". DH told me he thought she had eaten up all the dripping and juices with a slice of bread.
Then, after dinner, she asked if we would like fish pie or roast chicken for Sunday lunch. The DC love fish pie, so asked for that. She said, "Well, Mummy will have to make it, then." 
So, I proceeded to make two fish pies, as DH and two of my DC are dairy intolerant, and we hadn't brought enough rice milk with us to make a big fish pie. MIL said how interested she was to see how I did it, because she loves fish pie. (The woman is nearly 80 - she's had a long time to learn, if she really wanted to do so!)
When I was making them, she started to criticise what I was doing. I told her that if she wanted me to make a fish pie, I would do so, but if she wanted it made like some chef off the tele, she shouldn't ask me to do it! She went out and left me to it, then!