Can I file for green card for my parents if they are visiting the US on B1 visa?

In most cases, you should be able to file for your parents’ green cards if you are a US citizen and as long as they are not inadmissible to the US. A note of caution – please note that visitors to the US upon entry are not supposed to have an intention to immigrate as they make a representation when passing inspection that they are only going to be in the US for a period of visit. Therefore, steps towards immigration within 90 days of entry may bring questions from immigration officers as to your parents’ intent at the time of entry. Due to the limitations of the Lawyers.com Forums, Alan Lee & Arthur Lee, Esqs.’ (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence