Big bother Riley

I continue to be amazed at Riley's transformation from rambunctious kitten to responsible parent ever since we acquired Chaz. Riley never lets Chaz get out of sight and he's often found grooming him, much to Chaz's delight [most of the time]. Yes, they rough-house and tumble around but it's play, not aggression.
I have no idea how Riley learned to do all this since he was an orphan himself and got very little mothering. Maybe it's instinct? I will probably never know but it's inspiring to watch these two as they grow together.