As a U.S. citizen, you can sponsor your brothers, sisters, and adult children for green cards. But unlike spouses and parents, these relatives fall into the family preference categories, which have annual limits and long waiting lists. For siblings, the wait is measured in decades, not months. Understanding how the line works, and how to protect your family’s place in it, is what this guide is about. Who Falls Into the Family Preference Categories? Immediate relatives of U.S. citizens (spouses,…