So I gave them a drug called oxyton and magically they poop normal now! The three are fine now! Mum stopped feeding them altogether. I came up with the crafty idea to lay a soft towel at the bottom of their cage, set a box there and let the chicks run around in there. The dad now feeds all of them. The mum occasionally also does! All they do is run around and play! I even saw the oldest one chowing down upon some seeds! Mommy cracked them for it and dropped it on the floor and the chick ate it!! At night they go into that box and stay there piled up. It seems like that they are going to be fine!