Off-Peak Season Tickets are valid for 1 person + 3 children (aged 6 - 14) incl. Express bus, Mon - Fri from 9 am to 4 pm and from 6 pm until 6 am the following morning, all day on Sat, Sun and public holidays.
You will need an upgrade ticket for the 1st class on regional trains RB/RE. This ticket does not allow you to use any extras, such as taking along other persons with you or using the entire network (rings A-H) at the Weekend.
They are available as a monthly season ticket or even cheaper as an all-year season ticket.