Q: My parents are on green card and they filed I130 petition (Unmarried child over 21) on April 2001. Am I eligible for V1 visa in April?

Also If next year my parents get citizenship, can I change the I130 petition to first preference category.
What happen to my petition If I get married.

A: Yes, once one your parent(s) becomes a Naturalized Citizen you can upgrade your petition to the "first family preference" category. However, if you become married - your then Naturalized parent(s) should refile a new "third family preference" petition. Upgrade is not allowed in this instance.