Is mom back to work yet as in has to get up at a certain time and wake child if necessary to come to daycare. That will for sure help child get onto your schedule. Also it is possible to have two kids on totally different schedules and especially when they are little since they don't play with each other anyways. If the one needs to sleep at noon then just put them into bed and let them, second baby goes down and first one gets up to eat lunch. It does mean no real break for you but really when a baby is on the floor in a confined play space there is time for you to do whatever you need to do. And it won't last forever as they get older.