There are over a million households in “the 1%” because we have over 100 million households. Something like 127 million, according to the most recent numbers. Families make up about 65% of this total. However, they make up well north of 80% of the households in “the 1%”.
This means that for the top half of married parent households, around 1 in 10 of them is a “1%” household.