What to do with my dad's old Revel Performa F50's?

OP:

The drivers are just screwed in, though there might be some glue or crusty old foam gasket involved, a hair dryer may help. The leads are probably clipped onto the driver, just remember which color wire goes where.

Avoid touching anything from the surround inwards. When the driver comes out rest it with the magnet down, facing upwards and avoid keeping anything metal within a foot of it just to be safe, especially tools, rulers, screws.

There are repair people who will repair the surrounds for you once you have the drivers out.

Erik, the "surround" is just the surrounding housing? Or what do you mean specifically?

Just updated the photos so the condition of the speakers can be seen more clearly. 

Just a note to correct in you listing. Those are F52’s not 50’s. That might help for anyone that may just want them for parts.

Good advice from several here. Did your dad try to modify the speakers in any way? It seems strange that there would be damage to the rubber surrounds which are usually pretty durable, and then there is the missing paint on the front of a couple of the baskets.