User specific timesheets

Hi there,
I am trying to solve the following problem.

Infrastructure is Joomla 1.6

The problem:
I am part of a kindergarden which also depends on work done by parents. We would like to use our Joomla 1.6 website to keep track of the work done by the individual perants. The parents can use their individual logins to check their current hours booked. Additionally we would like to be able to 'report' on a class level (sum of parents with the same user group).

The parent page would look like
Name            Date of Booking              Text                   Hours
P1                    03/03/2011                   Project xyz         3
P1                    07/03/2011                   Project xyz         1
----------------------------------------------------------------------------------
SUM                                                                                4

Next parent (different login)
Name            Date of Booking              Text                   Hours
P2                    03/03/2011                   Project xyz         5
P2                    07/03/2011                   Project xyz         2
----------------------------------------------------------------------------------
SUM                                                                                7

Class overview page (other login / different role)
Name            Date of Booking              Text                   Hours
P1                    03/03/2011                   Project xyz         3
P1                    07/03/2011                   Project xyz         1
P2                    03/03/2011                   Project xyz         5
P2                    07/03/2011                   Project xyz         2
----------------------------------------------------------------------------------
SUM                                                                              11

Does anybody know of a component or an other option, that can do this?