One person in a household being required to carry a SR-22 should not affect the other policies of other drivers within their household.

The policies of these other drivers will need to reflect that driver (the one with the SR22) and exclude the driver. If those policies will not exclude the driver and are needed to cover the driver then those policies could be affected.

If the driver does not have an SR22 on any policy, then the household policy will need an SR22 for the driver.