These are not separate passes. The Swiss Half Fare Card is an optional add-on to the Swiss Travel Pass Flex, so that you can enjoy discounted traveling on the non-free travel days. That combination is called the Swiss Half Fare Card Combi. You and your wife would each buy the combination. Further details and prices can be found here.
All you need to know about traveling by train, bus or car in Switzerland.
Hand picked Swiss hotels and other accommodations are right here.
Swiss Travel Pass promotion 25% discountOnly if purchased in July 2021. Free cancellation.Buy via the SBB travel centre at https://shop.switzerlandtravelcentre.com or HappyRail at https://www.happyrail.com/swiss-travel-pass.