I got ambushed in hospital a few hours after a really traumatic birth by my in-laws. I didn't really want to see anyone; didn't mind my mum, but choice being mine I'd have had nobody that first day. But I wanted to be "fair" to both sets of grandparents.
My DP explained that I was not good, so grandparents only please and not to stay too long, and everyone else to wait until the following day when we (thought we) would be home. He sent two messages to his parents, and a message to his siblings, making it really, really clear.
In-laws decided to ignore him and bring the family, and then send (adult) SIL and BIL in first to jump out from behind the curtain as a surprise. While I was sitting there in agony, trying to learn how to breastfeed, in a puddle of blood, deathly grey, and waiting for a blood transfusion.
Then to add insult to injury, when DP asked why they were here when he told them to wait until tomorrow, SIL ran off crying and it became all about how she was so upset.
I'm still angry about it, six months on.