Asked them to make passports, file Ds-160 form $160 each, take visa interview appointment, attend interview , get visa , book flight and visit your love one in USA straight forward.....

My parents Visa was denied recently..I don't know what went wrong but were rejected after asking three questions. If you're inviting them, don't get too excited.

I think embassy officer use their best intelligent systems, if your parents are young, does not have decent profession, you do not have decent financial and other evidence based records in USA, more likely bad result. I have seen significant parents come under visit visa from Nepal working here in gas stations and stores and never return back to Nepal that historical trend trigger them to refuse visa. GOOD LUCK!

Khai kasto intelligent systems ho moosuri ko dal Mya chicken haru ko..