Depreciation on Home with Farm Land

[John Van Uytven]

Here is the situation. My brother is about to close on his first piece of farmland used mostly for grazing cattle.

The sell also includes a house that the current owners are living in.

My brother has his own home already. And he is considering renting the home or moving his family into the home. Then either selling or renting his current home.

Since the Farmland includes a house. How would this depreciate? Do they figure out what the house is worth separately? 

The current home he owns and lives in, if he started to rent that home, how would depreciation work since he has lived there for almost 4 years?

I am trying to advise my brother on the best course of action.

Thank you in advance.