→ You are not in Berlin yet, and you want to move for family reunification.
-Since you already have family in Berlin, focus on preparing the key documents. With these in place, you can apply for the national visa at the German embassy before moving.
Your priorities:
♦️ Family visa application (at the German embassy).
♦️ Valid passport and certificates (marriage or birth).
♦️ Health insurance coverage.
♦️ Financial proof (income or support from family).
♦️ Housing research or confirmation.
This is how you solve it: