Our first time momma had them on the grate too. I put them in a nesting box with some fur she pulled. Everyday she makes the nest better adding more fur and hay. Our babies are ten days old. She had four but we lost two. She has turned out to be a good momma though.
usually the Cali has the pink babies and the fur is white, from the litters we have had with our Cali's all babies get white fur. Given that there was another buck it is possible they are from him. They are cute and glad to hear that the does are doing well.
from what we have observed with our litters, the dark points start out gray and then will start turning black as the weather gets cooler. Our rabbit's ears were more gray this year as they were warm. It may take a couple of weeks or longer before you start seeing the color changes- can't remember the exact timing. Also if the babies get a little cold, they can get what is called nest box frost- gray hairs mixed in with the white- this will go away as they get older.