There is very little you can do, my dear. I would cover the back half of the cage (a large towel, a blanket or a crib quilt do the trick very well) and make sure the birds are kept calm and quiet (no noises, no sudden movements, no touching the babies or even putting your hand in their cage, etc. just peace and quiet and no staring at them, either) and put a couple of bowls or dishes with warm soft food in there to 'tempt' the mother. Also, make sure you keep the cage extra warm (heating pad on the bottom) and that you have handfeeding formula and appropriate syringes or pipettes to help with the feedings in case the mother has completely abandoned them. My lovebirds are sitting on five infertile (hardboiled) eggs right now (their second clutch of the season -I don't believe in breeding parrots) and she comes out every morning to fly around so, apparently, it's not as if they feel the need to sit real tight on the nest like other species (canaries, for example).