FRBRer & FRAD in Registry

[Haffner, Alexander]

Hello

I've spotted the element sets for FRBRer and FRAD registered by Gordon:
FRBRer: http://metadataregistry.org/schema/show/id/5.html
FRAD: http://metadataregistry.org/schema/show/id/24.html

In your paper "RDA Vocabularies: Process, Outcome, Use" you said:
Once the RDF version of FRBR is officially available from IFLA,
relationships between the same classes in the RDA-defined version of
FRBR and IFLA version of FRBR will be made to indicate that these are
actually the same entities.

I suppose this FRBRer registration represents the official IFLA
ontology, doesn't it? Accordingly, I'd like to make sure about some
details to understand things right...
-       So does this mean you link the already registered "FRBR entities
for RDA" to the corresponding FRBRer entities (i.e. by
sameAs-relationships)?  
-       How do you deal with the entity "family"? Do you link to FRAD?
-       How do you handle all the duplicated RDA relationships specified
in FRBRer? Will those be linked too or replaced? 
-       Furthermore, I am not sure if I got the idea behind specifying
additional types of entities beyond the classical ones (i.e. Sound
Recording Manifestation). I think all the additional entities in FRBRer
can be represented by the classical ones applying the corresponding
attributes. However, do these new entities influence the specified RDA
element sets? 

Thanks in advance for your reply!
Best, alex