大咖福利影院

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There is no minimum requirement for living as a family.
It is up to you how much space you want - or can afford.

Edited to add: There is indeed a minimum space requirement, below which a flat is deemed unsuitable for the purpose (and thus the landlord is not allowed to rent it out to you under such circumstances). Unfortunately this minimum differs regionally - most places specify 9sqm/person (in some places kids below 6 years are counted with only 6sqm), some others 12sqm/person.
But this are regulations to prevent precarius situations for the poorest of the poor, which you hopefully do not count as!