I literally just went through this same scenario. I have a dcg whos 16months and my own son who is 14 mos. dcg mom wanted me to slowly wean out morning nap, which to me is just prolonging the inevitable and is very difficult for a child. I put them both on one nap cold turkey and its been great! they were both getting up eraly in the afternoon and being very loud (giggling at each other lol) and it was disturbing the other dck nap time. now they are sound asleep and sleep 3 hours every day! the first couple days they were a little cranky closer to lunch/nap time but i tried to plan some outdoor activities to keep them occupied and now they are great.