The new rules will ban more than six people from meeting indoors as part of an extended household.
However, the rules will not apply to children aged 11 and under.
Currently, up to four households are able to form an extended household in Wales, except in Caerphilly County Borough – where extended households are currently banned.
The current rule allowing up to 30 people to meet outdoors will remain in place across Wales – including Caerphilly.
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