How much longer do you think The Family will last?

Until Zerb croaks 

Until the third generation come of age - there will not be fourth-generation adults 

Until the first generation have to go to retirement homes 

Like The Mormons, they will successfully eradicate their past, become mainstream, and continue indefinitely 

Until they are outlawed 

Until they all revolt 

Until Jesus comes back, at which point they will rule the world in LOVE 

Until the Flying Spaghetti Monster comes and turns them into bolognaise