Tristan and Percival are checking out the smelly new arrival napping in his cradle.
Before anyone freaks out, I should point out that Cat/Simon interaction is carefully monitored. Percy and Tristan like to stop by and sniff him occasionally (Good God, why?!), but other than that they never seem to want to get too close to their tiny, noisy, stinky new brother. We have been effusive with our praise.