Hi,
I am preparing I130 for my mom and am confused with one question.My father died 20 years ago and my mother has not married again. What would be the answer to question 8 where it asks to write the date and place of present marriage when she is not presently married to anyone? What would be the answer to q-11 where it asks to write names of prior husband. Well, my father is not her prior husband as the marriage did not end?

Would they (USCIS or NVC) ever gonna ask to submit my mother's marriage certificate?

Thanks in advance

So she´s widowed...I believe in the eyes of the government that means she is not married. When your spouse dies, your marriage ends.