They are now quarantining 2 generations of contacts
The close contact for 21 days
The close contact(s)* of a close contact of a confirmed case for 4 nights.
e.g.
The whole family of a dad who went partying and may have been in contact with a confirmed case.
The whole family of a maid who was in contact with a confirmed maid.
(As a result DBS took the precaution to close the school yesterday (Friday) as some boy(s) now in quarantine went to school before being quarantined).