Posted by: sara_solta11 July 3, 2019
Can I file petition for my parent who are currently in US through tourist visa?
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Shitu,
There are two ways to sponsor parents by us citizens older than 21 years.
a. Consular Processing : for parents living outside USA
b. Adjustment of Status (AOS) : for parents presented in USA legally.

Since your parents are here already you can file AOS (form I-485) at the time you are filing I-130 petition. It is not recommended to travel during process of AOS but USCIS provides advance parole to travel if requested.
If I understood correctly your parents want to go back to Nepal ("return here only after the petition is successful"). If they want to get back to US after their petition is successful why they are willing to go to Nepal if they can get their GC staying here? AOS is benefit given to beneficiaries get their status changed without leaving USA.
Hope it helps.
https://www.quora.com/Will-parents-of-US-citizens-get-a-US-citizenship


P.S: Above is not a legal advice, merely an experience.
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