I'm not talking about little babies who probably need to be with their mum and aren't a problem sitting in their buggies, but older siblings.
My DDs are in reception and are in separate classes and therefore they often get invited to separate parties which I don't have a problem with. But I wouldn't dream of turning up with the other one if she wasn't invited. However, another mum of twins in the same year always turns up with both of her girls regardless of what it says on the invite, and she usually brings their older (year 2) daughter. It's not a case of having no-one to look after them either because her husband also frequently comes, it's like a family day out .
I know it's none of my business (except when I'm the host) but I just wondered what other MN's thought.