Can spouses immigrate separately?

Question Details: I am U.S. citizen who is petitioning for my parents to immigrate here from the Ukraine. They have an interview scheduled and went in to get medical exam done. My mom had no issues, however they are requesting that my dad gets further testing which takes minimum 8 weeks. They are going to the interview together. Will they allow my mom to immigrate first or does she have to wait for my dad?

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