Registrations for trips are only possible for the person who is logged in. If you have additional family memberships, each person must be registered on the website i.e. it does not work with only one user id and both memberships under that person's name.
Once you want to register, each person must log in under their id and register for the trip separately.
This allows us to record for the trip leader the individuals' details such as grading, certifications and contact details.