I have posted many photos about sleeping cats. Trouble and Shiloh nap together, oftentimes entangled.

Today I see Shiloh wake up and then start licking her brother's head, his front legs, and his chest - everyplace she can reach.
Then she yawns again and goes back to sleep.

The Momcat will often come out of nowhere and lick her kittens from nose to tail. Trouble will groom his mother and sister.

The regimented behavior of cats as a "family unit" is something to see.