How can a whole family use SuperMemo on one computer?
Install one copy of SuperMemo and duplicate these databases that are to be used by the members of the family. You can store databases under different names in the default database directory (e.g. databases MUM, DAD, CATE in the subdirectory C:\SM7\DB), or under the same name in different subdirectories (e.g. database ENGLISH in subdirectories C:\SM7\DB1, C:\SM7\DB2, C:\SM7\DB3, etc.). The first solution is somewhat better, as upon running SuperMemo you will automatically be positioned in the default database directory, and will have to specify the database name only at Open. Otherwise, the full path should be specified or located by browsing the directory tree. Optionally, you can also use Miscellaneous : Users to define user working directories and passwords for all members of the family.
