Yeah, my idiot sister-in-law came out to visit us last year, with my two nephews. (Twins aged 12.)
Here they are, on a trip of a lifetime to the other side of the world, and her mom insists that they do at least 2 hours of homework each day. So, instead of taking in the scenery and culture of a foreign country, they had to sit inside and work on their maths skills. (While they could've been outside in the kayaks with me.)
The most frustrating thing about is that it was all for show.
She just wanted to show my wife and I just how "special" her little angels were. For example, she would go into the dining room where her boys were studying and ask them a long series of detailed questions and then instructions. The thing is... it was so obvious by the volume and tone of her voice, that she was only going in there, so everyone in the rest of the house could hear every her be a "special" parent.
It was all for show.
Those were the two longest weeks of my life.
(She scolded me in my own house, because I was using the term "fart" in front of the kids!)