Interesting that people think we’re being unreasonable, I didn’t expect that. For those that thought that, isn’t it sufficient that we’re saying come at the weekend instead (with no restrictions)?
When my wife’s parents were alive they would come and stay at ours midweek as they liked to leave us to have free time at the weekends. When my wife’s mum died we used to take her dad on holiday, it was far from ideal, but he needed a break and he enjoyed our company. Sometimes we need to do things that suit other people, particularly our parents, rather than ourselves.
I think you’re making a far bigger deal of this than it needs to be, its a few days where your otherwise dull evenings will involve someone else, hardly the end of the world.