Not very helpful though because @sydney is talking about number of children and the data you quote specifically says "A household is defined as one person living alone, or a group of people (not necessarily related) living at the same address who share cooking facilities and share a living room or sitting room or dining area".From the Office of National statistics in 2018 (most recent I could find with definitive data). Size of UK households by ethnicity:
Including the 3 categories of 5, 6 and 7 or more. So the blow figures represent percentages by each ethnicity with 5 or more in the household.
White 11.66%
Mixed/multiple 20.96%
Indian 21.96%
Pakistani/Bangladeshi 60.82%
Chinese 15.41%
Black 30.90%
Other 32.78%
There was a time when people use to look back on the era where granny and grandad and cousins and aunties and uncles all lived under the same roof.