As the title says... After you finish the 3rd sibling are you forced to take on Joseph right away?
In other words, can you finish some side missions between finishing off the three regional heads? Or do you need to take care of any side business before you defeat the last regional head?
So far for me I have not forced to the final ..
I was (annoyingly) pulled off a side mission to be forced into the 3rd sibling finish, however since then, I have just been cleaning up the side missions etc.
To Be Honest i am not going to finish the "father" mission as reading about the endings,leaves me uninterested. So will finish as many of the quests, preppers, stunt events etc and then just give up