For me morning nap is for the ones who need it which is 8:30-9:30. All my little ones, including my son are 11-14 months old and all are early risers. Afternoon nap is mandatory here is 12:30-3. I would try putting the dcg down earlier because once you miss that little window and they get overtired you are in trouble! For the dcb do his nap same time, only 45 mins max then make him stay in the playpen the entire afternoon nap period. Babies tend to have 45 minute sleep cycles so him waking up after 40 mins makes a lot of sense. Go in once and reassure him, lay him back down, tell him night night and leave the room until nap time is over. Have you tried darkening curtains? A white noise machine? I have 5 white noise machines and they are fabulous!