Ref: thread Did anyoneelse notice that Godfather II flashback scene - Vito's surprise birthday party
post by user The Last Woltz on 29 August 2016

Extract:
Originally Posted By: The Last Woltz
Vito's influence on all the men in the scene was powerful and, ultimately, destructive. Having him as an invisible spectre really emphasizes how his legacy is still impactful years later. It also shows how he was the central force holding a very disparate group of people together - something nobody else could manage.

Spot on! Woltz
So true Vito was able to hold the “very disparate group of people together” I believe solely because and of utmost importance - everyone unequivocally accepted Vito as the undisputed head of the family, no matter what

Among others,
1. At Connie's wedding, everyone had gathered posing and the photographer was about to take the 'family' photo when Vito suddenly stops it because Michael wasn't there Everybody including Carmela not necessarily agreeing but unequivocally accepting what Vito had just done
2. Connie said to Michael [unwilling to believe that Vito could had anything to do with it] Michael waited until Vito died to murder Carlo even though “everyone blamed Carlo for Sonny's death”
3. Connie would never have treated Vito so insolently as she treated Michael at Anthony's party
4. Fredo would never have done, what he did to Michael [kid brother] 'betrayal' to Vito [father] or even Sonny [older brother]
5. Carmela would never have done, what Kay did to Michael 'abortion' to Vito