1) MAJ de la table SupportMembers : ajouter le champ FamilyID
ALTER TABLE `SupportMembers` ADD `FamilyID` SMALLINT UNSIGNED NULL AFTER `SupportMemberStateID` ;
ALTER TABLE `SupportMembers` ADD INDEX ( `FamilyID` ) ;

2) Initialiser la valeur du champ FamilyID dans la table SupportMembers pour faire correspondre chaque compte de type 5 à un ID de la table Families (FamilyID) :
UPDATE SupportMembers s INNER JOIN Families f ON (s.SupportMemberLastname = f.FamilyLastname) 
SET s.FamilyID = f.FamilyID 
WHERE s.SupportMemberStateID = 5

3) Création des tables WorkGroups et WorkGroupRegistrations :
-- 
-- Structure de la table `WorkGroupRegistrations`
-- 

CREATE TABLE `WorkGroupRegistrations` (
  `WorkGroupRegistrationID` smallint(5) unsigned NOT NULL auto_increment,
  `WorkGroupRegistrationDate` datetime NOT NULL,
  `WorkGroupRegistrationLastname` varchar(50) NOT NULL,
  `WorkGroupRegistrationFirstname` varchar(25) NOT NULL,
  `WorkGroupRegistrationEmail` varchar(100) NOT NULL,
  `WorkGroupRegistrationReferent` tinyint(3) unsigned NOT NULL default '0',
  `WorkGroupID` tinyint(3) unsigned NOT NULL default '1',
  `FamilyID` smallint(5) unsigned default NULL,
  `SupportMemberID` smallint(5) unsigned NOT NULL,
  PRIMARY KEY  (`WorkGroupRegistrationID`),
  KEY `WorkGroupID` (`WorkGroupID`,`FamilyID`),
  KEY `WorkGroupRegistrationReferent` (`WorkGroupRegistrationReferent`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='Table which contains registrations for workgroups.';

-- --------------------------------------------------------

-- 
-- Structure de la table `WorkGroups`
-- 

CREATE TABLE `WorkGroups` (
  `WorkGroupID` tinyint(3) unsigned NOT NULL,
  `WorkGroupName` varchar(50) NOT NULL,
  `WorkGroupDescription` varchar(255) default NULL,
  `WorkGroupEmail` varchar(100) default NULL,
  PRIMARY KEY  (`WorkGroupID`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COMMENT='Table which contains workgroups.';

4) MAJ fichiers php/js/css