Can I (US Citi) adopt my sibbling (Student Visa- US) who is 23

Short answer is ‘No’ you can’t adopt your 23 years old sibling for immigration purpose.
 
Family migration?
Dude becomes a USC, parents in the US on a b2 and i485s, sis on a f1 and wants to adopt.

I've heard of queries for adopting nieces or nephews into the US, 'adopting' a sibling is a new one.
 
I don't know. There are some ways to get around, but there is a very long procedure.

This forum does not provide guidance on “ways to get around” immigration laws nor does it condone those who try to do so. Your response to questions here should be based on immigration laws says, if you don’t know don’t respond.
 
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