The amount of a spouse’s benefit is as follows:
               If only one spouse is entitled, they receive one-half the PIA of the NH subject to
                  the normal rules on adjustment for the maximum and the rounding of benefits, and subject
                  to reduction for age.
               
               If more than one spouse is entitled, each qualifies for an amount equal to one-half
                  of the PIA, subject to the rules on adjustment for the maximum and rounding of benefits,
                  and subject to reduction for age.
               
               When a legal spouse and deemed or putative spouse are simultaneously entitled, the
                  legal spouse’s benefit is not subject to adjustment for the family maximum for the
                  first and all subsequent months of entitlement. This is effective for benefits payable
                  for months after December 1990.