how many peoples are there in your family

1.How many (OR: How many people/adults/children ...) are (OR: are there) in your family? ~There are five (There are five people/adults/children ...)
2. What's (OR: What's there) in your bag? ~There are two pairs of trousers, two shirts, some socks and a travel guide.

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I guess #1 is an example of a double omission of subject. Am I right?
It's interesting that the answers tự contain the impersonal subject there, although the whole construction "There are" could be omitted.