Home, At Home

• Is anybody at home? (NOT — at the home?)

At is often dropped.

• Is anybody home?

Home (without to) can be used as an adverb referring to direction.

• Let us go home. (NOT — to home.)

There is no special preposition in English to express the idea of being at somebody else’s home. We often express the idea by using at with a possessive.

• We spend the weekend at the Smiths’.