You will need a guest certificate.
Here is some info from RCI.
10. GUEST CERTIFICATES. An RCI Weeks Member
may give a Confirmation to a friend or family member by
purchasing a Guest Certificate from RCI for the current
Guest Certificate fee on the date of issue. It is the
responsibility of the Member to forward any and all
correspondence regarding Guest Certificates to the
guest.
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Guest Certificates may only be used by the individual(s)
named on the certificate and their guests and may not
be used by persons under the age of twenty-one (21).
Guest Certificates are non-transferable, and may not be
used for any commercial purpose, including auction,
rental or sale. Their use is subject to any conditions,
restrictions or limitations which may be imposed by the
Host Resort.
RCI Weeks Members are responsible for all acts and
omissions of their guests and for any damages caused
or expenses incurred by their guests.
RCI will fully refund the Guest Certificate fee when a
Guest Certificate is canceled more than sixty (60) days
prior to the beginning date of the Confirmation. RCI will
not refund the Guest Certificate fee when a Guest
Certificate is canceled within sixty (60) days of the
beginning date of the Confirmation.
RCI reserves the right, in its sole discretion (without
refund or credit), to revoke a Confirmation or Guest
Certificate, terminate or suspend the membership of the
relevant RCI Weeks Member, or deny access to any of
the products or services offered in connection with an
RCI Weeks Membership in the event RCI Weeks
Members, or their guests, misuse a Confirmation or
Guest Certificate or otherwise breach the Terms and
Conditions of RCI Weeks Membership.