If a new patron is cloned from another patron (eg, a child's card is cloned from a parent's card), they are automatically grouped together. You may also manually group different patrons together.
If you open the Group Member Details and no one (including the patron you are viewing) loads in the list, please refresh your browser window to get them to display.
There are no PINES policies related to groups, but if members of a group have fines, the sum of all the fines will appear in the patron summary bar when any member of that group is opened.