What questions can we expect at family based green card interview?

I am a US citizen and am sponsoring my mother's GC. What questions can we expect in the interview? Any advice is appreciated. Thanks!

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How long does the green card procedure takes?

my mother apply for me to get a green card in july how long does the embassy takes to call you to tell you that your papers reached and after that how long do you take to get it.

my mother is a us citizen , am 18 and not married , am from a Caribbean island call Trinidad

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