Hiya again just replied to your other post in the baby section.
I'm in a similar situation to you in that our lo's are the same age. I have managed to cut dummy usage down to her one nap through the day and at night for bedtime. I keep it upstairs and if she asks for her "num num" i tell her no its only for "bo-bo's" which seems to be working so far.
I am still trying to decide when the right time is to take it away all together because i think at this age it would mean a lot of controlled crying at night because i think they are too little the now to understand any concept about dummy fairies etc.
I read on here someones suggestion about tying it to a helium balloon and letting it float away and i think maybe at this age they might understand that, my little one is obsessed with "birdies" so maybe it would work if i tied it to a balloon and told her it was away to the birds.
i think just now it is more of a case as to when i'm ready! LOL, i also have the difficulty in that my OH doesn't see the dummy as big an issue as me.
Think when i do try it though will make sure i have two weeks off work to really see it through properly, think i will definitely have more willpower if i'm not tired with work etc so maybe that does mean i'm lazy LOL!