What is the purpose of the adoption? As noted above, an adult without legal status may be able to be adopted in your state however the adult will not be able to get immigration benefits through the adoption. However the adult may be eligible under the new deferred action program for childhood arrivals (DACA) which would allow work authorization, etc. I recommend that you consult with an immigration attorney to determine your best options. Feel free to contact me.
C.J. Lyford
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