I've got another one.
A mutual favour between my mother and I. We live in a different part of the country and it came up in conversation (I can't remember who initiated it) that she and her partner could house sit and cat sit for us whilst we were on holiday (just a Monday to Friday trip in a caravan in Cornwall). They'd get the opportunity to explore the local area with free accommodation and we wouldn't need to pay for the cattery.
We made it clear that this was not a catered holiday for them. We were already having to cater our own week at the caravan we were going to, and couldn't afford to do a shop for them too.
When they arrived we said that they were welcome to help themselves to whatever was in the cupboards and any fresh food still left in, plus tea/coffee etc, but could be they leave the food in the freezer as we planned to use it.
We left on Monday morning at about 4am, before they were up. At 1030am I got a phone call asking if they could have the pork chops from the freezer. I said no, we'd already explained that we wanted those.
She then proceeded to ring and text me every day of our one holiday a year with the messages becoming increasingly abusive, telling me how disgusted she was that I wouldn't let her help herself, that they were yellow stickered anyway so we were mean to not give her the £1.80 or whatever chops, how when she visits her brother he won't let her buy anything and fills the fridge with her favourite foods.
At the time I was a SAHM, we had two under three and our only income was my husbands. My mother lives alone in a council house so pays minimum rent, but no longer needs it as she works full time and earns an excellent wage. She is not short of cash at all.
I stopped answering her texts and calls so she started messaging my husband instead. He also ignored her.
Eventually she flounced home early on the Thursday and dropped our keys with a friend who lived round the corner so that she could sort the cats.
The 'fucking pork chops' are now legendary in our house and my husband has not seen or spoken to her since that week (June 2015). She was never invited to stay at our house again and when she popped in on her way past from staying with another relative, he would make sure that he was out. I'm NC now too and it's a relief.