Can B2 visa be changed to Permanent Resident after marriage to a US Citizen?
The first route is through the petition of a close relative — spouse, child over 21, parent, brother or sister who is a citizen of the US; or spouse or parent who is a US permanent resident. (Anyone born in the US is a citizen of the US; permanent residents can become citizens through naturalization, after a required period of residence in the US.) Some of these routes to permanent residence are severely back-logged, however, depending on the type of relative and the nationality of the applicant. The brother or sister of a US citizen could have a wait of many years, depending on their nationality. For more information through this route, visit USCIS web site.