what about parents that sit at home and drink a bottle of wine a night? or 4 cans of beer?
are they also incapable of looking after their kids... i know a few that do this..
maybe a bit different if the kid has gone to bed... and perhaps depends a bit on the kid - does he/she sleep through the night at 18 months or will the tipsy parents need to attend to him/her a lot? Are there medical issues etc..