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Reposting from Bug ID 3591 because it's over 9 years old, and I'd really like to see this feature implemented. Linked here: https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=3591 
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I'd like a designated parent to have the ability to access all the OPAC features that their children normally would when the latter log in to the OPAC under their own accounts.

In other words, when a parent logs in to their own account, they will also be able to do all of these for their children's accounts: 
(from http://koha.org/documentation/manual/3.0/opac/your-account)
View and renew items checked out
View and renew items overdue
View status of and cancel holds you have placed
View fines you owe
Submit changes to your personal details (like name or address)
Submit a change to your password
View your Reading History (also known as 'Checkout History')
Manage your purchase suggestions (view status and add)
Manage how you're notified by the library of events and due dates
Review an edit your lists

If new features are planned under 3.2, then these should also be available.

Rationale: A family administrator account would make it much easier for families to maintain their library accounts. At present, for example, the simple task of making a list of all family items due back would require a parent to set up user logins for each of his/her children & log in under each of those accounts.

Note that this should be an _option_ at the child account level. To meet librarians' long-standing respect for patrons' privacy & intellectual freedom, access to account information for young adults in particular may need to be limited to that account alone (& staff of course.)