With a bit more context, yes they sound quite irritating.
But why are you letting them call the shots? Or taking on the 'responsibility' of this yourself?
So they didn't really want to know that much until retirement, now they want to come once a month. It's ok to see that as a bit cheeky, so curb them a bit. 'No, we're pretty busy right now, how about ?' Make sure it's not once a month but more like every six weeks. Or whenever YOU say is convenient.
They suggest 12 and want lunch? Ok either you're out and your DH can decide whether he wants to make lunch or not, or you can say no, out until 2, come at 2.30. THEY fit round YOU.
Never been to theirs? 'Well it's really our turn to come to you after all this time, if you're going to be coming so frequently! When is good for us to pop in?' Be blunt. Let MIL tie herself in knots finding a way to tell you that she doesn't want to host you, but she wants you to host them every four weeks.
FIL is a bit of an arse? Go out when they come! They're not your parents.