One is out for Sunday the other is in. One was away for two nights last week the other was away for one night - different nights. One was out on Friday the other was in.
AIBU to suggest they get together and plan their social lives so I can have screaming sex with their father without them running up and down stairs and knocking on the door to ask me where their pants are. In the drawer btw - like they always are! Ffs.