unmarried children of siblings has to be under 21 for FB4, but when?

collector

New Member
I am planning on filing for my sister under FB4. Her child is 12 years now but will be more than 21 years by the time the priority date will be current. I can't find anywhere when the child has to be under 21, when filing or when visa is issued. Any suggestion?

Thanks in advance.
 
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