Marco Vespucci WAS NOT part of the Pazzi Conspiracy. His wife Simonetta had died exactly two years earlier, 26 April 1476.
Lorenzo's grandmother Contessina died in 1474, after he took over running the family following his father Piero's death in 1469.
Jacapo Pazzi, who had originally opposed the attempt to overthrow the Medicis, was not inside the cathedral at the time of the attack.
Lorenzo's uncle Carlo was at least 18 years older than Lorenzo and died the same year as Lorenzo, 1492. It is unknown how much time he may have spent in Rome during his ecclesiastical career.