Administrators at the European Commission and other EU institutions are placed in grades starting with AD 5 and ending with AD 16 reserved for Directors General.
AD 6 is one of the initial grades for Administrators and is considered an entry grade, although the salary of an Administrator AD 6 is higher than for most Contract Agents.
Official cohabitation counts as family and entitles you to the allowance. In case it’s relevant to anyone, same sex couples…