I think it's actually good for kids to share a room. It teaches them to get along, share, compromise and strengthens the bond between them. I shared a room with my brother until we were 9 and 12 and I have special memories of it. My two little ones started out sharing a room, but we had to move my daughter's crib into our office for now because they kept waking each other up...especially at naptime. Now we are considering moving them together again as the youngest sleeps through the night now, but we'll wait until my almost 4 year old goes to school in September if possible to avoid the naptime problem. They are boy and girl, but I see no problem with them sharing until they are a bit older and need more privacy.