So the way I see things, looking at the Bonding guide. Baby Peanut is exhibiting fear-aggression by rumbling and bum-wiggling. This is interspersed with zoomies, popcorns, eating, exploring and napping. He also keeps trying his luck to go into the hidey where Pistachio is resting.
Bereaved Pistachio is occasionally chasing him, sometimes with teeth chattering and I have seen him force his nose up once. I think as the guide says, he’s a reluctant dominant (he was submissive to his brother) and it is taking some time to work out. Mostly he’s resting while Peanut is more active. I hope this doesn’t become a nuisance to him.
If there is another fight as last Friday, I will separate forever and they can live side by side. I just hope they are OK overnight…