There appear to be many errors or possible errors in the dates given in the "Family Tree" on the bonus disk. Apollonia didn't die in '47, nor did Sonny die in '48. Vito and Carlo didn't die in '55. Santino Jr. wasn't born in '45. Victor Rizzi wasn't born in '49. Mary probably wasn't born in '53. Francesca and her twin probably weren't born in '37. Paolo Andolini probably wasn't born in 1887. And Hagen probably wasn't six years older than Sonny. It's unfortunate because the "tree" is likely to be regarded as definitive.

I think it's got Dutch elm disease.

I made a mistake in my earlier posting on the "Family Tree." I meant to say that the Don and Carlo didn't die in '54, as was listed in the "Tree." 1955 is the date of their deaths--the key year when Michael settled all family business. It's confirmed in the Don's burial scene. Look for a closeup on his tombstone, which reads, "CORLEONE Vito April [xx] 1887, July [xx] 1955." '55 is confirmed during the baptism/massacre scene, when you see Clemenza, clutching his gift-wrapped shotgun, get into a '55 Cad.
The tombstone appears to put the lie to the "Tree"'s listing of 1892 as Vito's birthdate, but the child Vito who flees Sicily in 1901 looks more like a 9-year-old than a 14-year-old.

Turnbull -- These are the dates I've been working on for 5 years, with DVD descrepancies added:

The Corleone Family Timeline

One problem is that the Don's birthdate on the tombstone from GF1 doesn't match the Pearl Harbor Day reference in the GF2 flashback. The DVD went with Pearl Harbor.

JG

Children back then were undernourished and starved so you can probably understand his ageing process.

one thing that's always drove me crazy from on all timelines and birthdays is that Vincent is supposedly older than Victor. That's impossible. We see Connie and Lucy (the mothers) on the same day when Sonny goes from his mistress to his sister. Connie is noticably pregnant. Lucy is not. So since Victor's her oldest son, he would be older, if only by a few months, than Vincent.

I looked at the family tree but never gave close attention to the dates. Now, going by what Turnbull has said it says that Sonny died after Appollonia which is definately not true as Michael learns of sonnys death whilst he's teaching Appollonia to drive.

I guess FFC didnt care as much as he said he did.