My husband is living in Germany, we have rented appartment there. What kind of evidence is required to prove that I live in Germany for more than 6 momths?

Thank you very much for a prompt reply.

Hey, guys, could you please help me out with my father's application. Circumstances: 1. I am British now, my husband is British who has been working in Germany for 7 years 2. I never live in Germany with him but visit him some time, our home is still in the UK and my husband cames back to the UK ...