A - compared to is unnecesary. Coz u know, "compared to" is another idiom for comparison which is useless since there is an idiom as.... as to compare already.
B - Correct.. correctly uses as ... as idiom and compares "households" precisely.
C - Households are compared to "children and grandchildren"
D,E - than is a wrong idiom for as... than
you are not incorrect, by the way, about omitting "there are"; you would indeed get a grammatically correct sentence that way. the problem, though, is that the resulting sentence would be extremely awkward and difficult to read.
So, What we learn from this SC question is that:
Both
as many x... as y.. and there are as many X…. as there are Y… are perfectly correct.
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