Train Pass Suggestion

What pass is recommended if I want to go from Orly, Paris to Florence, Italy? We are 2 adults, 1 teen, 1 child. When in Florence, we want to go to Genoa, Cinque Terre, Nice within 5 days.
From Florence, we would then want to go to Rome for another 5 days. Perhaps train hop to Venice for 3 days and 2 days in Milan.
Finally, then go back to Paris for the remaining 5 days.
Is there a pass for all these train trips?
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