I am donning my hard hat.
My PIL seem to think that it is fine to call at 9.30 on a week night just for a chat and a catch up at least once a month (this isn't the only time we talk to them). Every time they do it we answer asking if everything is ok, because you'd think that if someone was calling at that time something might be wrong. But they don't seem to get the message. AIBU to get irritated by this?