Mabel delivered four kittens, but sadly the second was stillborn, and the third (pictured below in the middle) passed away this evening. I suspect the white one will die tonight as it refuses to nurse, even when put right on a nipple. I'm not sure if the fourth one will be able to survive without any litter mates, but it seems stronger and seeks out nursing opportunities. Henry was there diligently caring for the new arrivals and Mabel throughout the night. The little family has been snuggled together in their box.
Edited to ad: We replaced the small box with a larger box in hoped that the extra space allows Henry to join Mabel and the kittens without smushing them as much.