Fredo comes back to Vito's room, didn't even get a glance from Vito but Fredo stays with Vito anyway

Sadly, it also showed not the first nor the last time, among others -
1. how Fredo doesn't even get an acknowledgement
2. how Fredo was treated by Vito following on Sonny, Michael even Mama
3. “And Fredo -- well -- Fredo was -- well --”