There's an article here where Floyd sr appears to intimate that he would go to his son's corner if a re-match were to take place, and his son wanted him. Again this is all 3rd party quotes so has to be taken with a pinch of salt, but Sr does say about a possible Ricky-Floyd rematch "I've been training Floyd my son since he was a baby — he knows all the tricks. Ricky I just got training when he was 30 years old" & that "There is no one near my son". This could all be bollocks, but it does seem to suggest that Floyd Sr would go with PBF if their relationship was sorted

Boxing: Floyd Mayweather Sr faces choice between his son and Ricky Hatton | Sport | guardian.co.uk