Hi ate rhema, firstly, Do you intend to live in the caravan with your bf or in his brother's house? you mentioned that your bf uses his brother's address in his bank details, I assume all of his other documentation has his brother's address on it? If so, then you have to use his brother's address for consistency. If his brother owns the house then he need to write a good letter confirming that you are OK to live there along with the copy of the deeds and other mortgage documentation. If his brother is renting, then the letting agent will have to write a letter confirming the size of the house, the availability and adequacy of accommodation along with the copy of tenancy agreement and utility bills.(I'm sure someone will correct me if I'm wrong).
Hope this helps.
Juvy
