As more undocumented immigrants are deported, a disturbing question will be, what happens to their children, especially those born in the U.S. and therefore citizens by birthright.
The Phoenix New Times has a detailed story by Antonia Noori Farzan and Sean Holstege.
Sometimes older siblings or other relatives (who might be undocumented) have to raise them. Sometimes they are put into foster care.
The Migration Policy Institute has a 2016 profile of children with undocumented parents here. Nearly 80% were born in the United States.
An Arizona group called LUCHA (“fught”) does organize fundraisers for affected families.