Nicky,
Going to help you out here. The references in my post are just a joke but I take my "Godfather" trivia seriously.
It is definitely Tattaglia (don't pronounce the "g")
Philip, the old man, was killed in bed with one of his hookers when Michael took control. Tessio said that Bruno, the son, got hit at "four o' clock in the morning" after the hospital scene with Michael and Captain McCluskey.
Bruno below during the rub out of Luca Brasi
Philip at the mafia don meeting below
I could give all my picks for who in the CR mess should play who in the "Godfather", but you start. However, while Marinatto looks like Clemenza, I think he is a cinch for Fredo.