In the very begining of GFII we see Fredo and Deanna pull up in a car and into the Corleone Tahoe compound. Arriving at the party.
Yet when the hit hit attempt is made on Mike, Deanna comes running out of the house, on the compound, screaming and yelling that "they were right outside my window."
Did Fredo actually live on the compound, or was he just a guest that evening?