Immigrant families are often separated at border detention facilities. Studies have shown that the experience can cause lifelong trauma not only for isolated children but also for their parents and siblings.
Resources:
Southern Poverty Law Center's Family Separation Under the Trump Administration timeline
Mental Health of Immigrant Children Separated From Their Mothers at the U.S.-Mexico Border from Psychiatry Research
The Atlantic's "How Trump's Family Separation Traumatized Children" video
CBS News' "The Faces of Family Separation" documentary