Should be 50/50, but needs ti account for the varied wages and ability to pay.
Say one of you earn $80k a year the other earns $20k a year. Is it fair that the person earing $20k a year is forking out a higher proportion of their income?
You could always give them the friendly reminder of how that Usyd Philo Gonazles's(?) parents treated him [much the same as urs treat you] and what happened to them
OR go to user CP==> unselect "Receive Email from Other Members", "Receive Email Notification of New Private Messages" & for Do for "Default Thread Subscription Mode:" choose "Do not subscribe"