This question does not provide enough information to determine whether to purchase on a per-household or per-capita basis. Typically, this depends on the specific regulations of the product or service provider being purchased. Here are some possible scenarios:

  1. PURCHASE BY FAMILY: Certain products or services may allow one household to purchase one copy, regardless of the number of family members.
  2. Per capita calculation: In some cases, everyone needs to purchase their own share, so it is calculated on a per capita basis.

To get an accurate answer, you need to check the specific purchase terms or consult the relevant service provider.