- 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’.