US citizen guardian of foreign citizen child?

kckfs

Registered Users (C)
Sometime in the next few months (just waiting for Oath) we will become US citizens (and therefore dual UK/US nationals). My wife was just asked by her sister to be the legal guardian for her sister's two children, currently ages (nearly) 17 and 15. Her sister and children are UK citizens, ordinarily resident in the UK. While it is extremely unlikely we ever will become guardians (sister is healthy etc), and especially because both children are nearly adults, in the event we did become guardians what would our options be?

We might want to bring them into the USA temporarily, but other than a visitor visa are there any other options? Given the children's ages we would probably try to make arrangements for them to stay in the UK and complete their schooling there. As I say this is almost certainly a theoretical issue, but we were wondering.
 
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