Mexican families trying to reunite legally in the United States are facing waits that can stretch a quarter of a century, according to a new analysis of the family-based immigration system.
The study of the Migration Policy Institute finds that approved family petitions do not necessarily mean families are close to reunification. For Mexican applicants in the F3 category, which applies to married sons and daughters of U.S. citizens, the government is still processing cases filed more than 25 years ago. In the F4 category, for siblings of U.S. citizens, Mexico's backlog is also among the deepest in the world.
The delays are not simply the result of paperwork. They are built into the structure of U.S. immigration law, which limits the number of family-sponsored visas available each year and caps how many can go to applicants from any single country. The State Department's July 2026 Visa Bulletin shows current family-sponsored priority dates and is the official monthly guide for which applicants may move forward.
Family-sponsored preference visas are capped at 226,000 a year, and no country can receive more than 7% of the combined annual family-sponsored and employment-based visa total, regardless of population size or demand, according to the Migration Policy Institute.
That rule hits Mexico especially hard. Mexico sends more immigrants to the U.S. than any other country and has one of the largest family-based backlogs, but it receives the same percentage cap as countries with far fewer applicants. The result is a bottleneck where an approved petition can sit for decades.
More than 3.8 million people were waiting abroad in family-sponsored immigration backlogs as of recent government data cited by the Migration Policy Institute, not including people already in the U.S. waiting to adjust their status. FWD.us, citing State Department data, has also placed the overseas family-based backlog at nearly 4 million people.
For families, those numbers translate into missed graduations, weddings, births, and funerals. Some petitioners die before their relatives' cases are resolved. Children listed on petitions can become adults during the wait, changing their eligibility or complicating the case.
The human cost is also measurable. A 2024 systematic review in Social Science & Medicine, cited in the study, found that family separation linked to immigration policies is associated with higher rates of depression, anxiety and sleep disturbances among separated children and parents.
The findings add new urgency to a long-running debate over legal immigration. Advocates argue that the backlog undermines the idea that families should "wait in line," because the line itself can last longer than a generation. Critics of expanding family-based immigration say caps are necessary to control overall immigration levels.
For Mexican families, the practical reality is starker: a legal petition can be approved, the relationship can be valid, and the sponsor can be a U.S. citizen, yet reunification may still be decades away.
